Presumably Fr. Pfeiffer has valid holy oils now. After Easter 2021 he will probably use oils consecrated by himself. These will be doubtful. Now, he probably gives validly the sacrament of Extreme Unction. After Easter it will be doubtful, also for the priests associated with him.

Now?  So what was he using before?  
How do you know these now are valid?

https://amp.freep.com/amp/3422325001

Proper formation, validity, words, licitness, humility, and proper Catholic teachings are important.

I don't know what oils he has now. I just presume that they are from a valid bishop. I don't think Ambrose did a chrismal Mass for him.

Presumably Fr. Pfeiffer has valid holy oils now. After Easter 2021 he will probably use oils consecrated by himself. These will be doubtful. Now, he probably gives validly the sacrament of Extreme Unction. After Easter it will be doubtful, also for the priests associated with him.

Your first statement, above, says " Fr. Pfeiffer has holy oils now" and your second statement, atop, say you "don't know what holy oils he has now".
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How can you be sure the ones he has now are valid if you don't know what he has now?
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It is unlikely he has had valid holy oils for some time unless, again, he violated canon law which demands that old oils be disposed of and new ones received yearly.  Ergo, his, Fr. Hewko's, and the priests with him have given illicit and possibly invalid sacraments.
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Why do you "presume [the ones he has now] are from a valid bishop" when he has no bishop superior and no good relationship with ANY 100% unquestionably valid bishop?
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William aka Ambrose Moran is not valid.
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We must assume Fr. Pfeiffer is not a valid bishop until he proves he is.

In one of his talks from 20 years ago, Fr. Hesse said olive oil is a necessity for validity, no olive oil, no validity - period. This was his response to Pope Paul VI's decreeing that any oil will suffice.

For solemn Baptism, which is baptism done by a priest following the rite in the Roman ritual, baptismal water is required. Baptismal water can be made by a priest at any time, normally it would be made at the Easter vigil, but it requires oils blessed by the Bishop on Holy Thursday to make it. For private baptism any water will do. Babies are being privately baptised today because in places there is not a priest to do the baptism.
For extreme unction the oil of the sick is required. it is blessed by the Bishop on Holy Thursday along with the sacred chrism and the oil of the catechumens.

The oil has a "best before" date in that the priest is supposed to use the current years oil. But it does not have a "use by" date, so oils from a previous year do not "go off" and are still holy oils, and can still be used. Baptismal water doesn't "go off" either so it can still be used for solemn baptism even if made with out of date oils.

It really doesn't matter what oils Fr. Pfeiffer has now. The point is that a priest can validly give confirmation but not legally. If Fr. Pfeiffer gives confirmation now it will be valid depending on if he has valid sacred chrism or not. I would suspect that he does have valid sacred chrism but I do not know this. But next year after Easter he will certainly consecrate his own oils. They will be very doubtful and his confirmations will be doubtful. His Extreme Unctions will also be doubtful. Baptisms will still be valid. Absolution from him will be valid, but from those he "ordains" ??

For solemn Baptism, which is baptism done by a priest following the rite in the Roman ritual, baptismal water is required. Baptismal water can be made by a priest at any time, normally it would be made at the Easter vigil, but it requires oils blessed by the Bishop on Holy Thursday to make it. For private baptism any water will do. Babies are being privately baptised today because in places there is not a priest to do the baptism.
For extreme unction the oil of the sick is required. it is blessed by the Bishop on Holy Thursday along with the sacred chrism and the oil of the catechumens.

The oil has a "best before" date in that the priest is supposed to use the current years oil. But it does not have a "use by" date, so oils from a previous year do not "go off" and are still holy oils, and can still be used. Baptismal water doesn't "go off" either so it can still be used for solemn baptism even if made with out of date oils.

It really doesn't matter what oils Fr. Pfeiffer has now. The point is that a priest can validly give confirmation but not legally. If Fr. Pfeiffer gives confirmation now it will be valid depending on if he has valid sacred chrism or not. I would suspect that he does have valid sacred chrism but I do not know this. But next year after Easter he will certainly consecrate his own oils. They will be very doubtful and his confirmations will be doubtful. His Extreme Unctions will also be doubtful. Baptisms will still be valid. Absolution from him will be valid, but from those he "ordains" ??

Canon law states that holy oils/chrism must be disposed of after one year and new ones obtained.  So, illicit (illegal) if old are used.
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It does matter what he has now.  If they are not valid then the sacraments he does or has done with them are questionable.
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Whatever ones he "makes" himself, will definitely be questionable.

Time for fasting and praying for all. 

You all DO remember there is serious doubt regarding "Bp." Pfeiffer's consecration, right?

Just as an aside.