Here's the SSPX study showing the New Rite of Consecration is valid. Iirc, His Excellency Bishop Williamson endorsed this SSPX study. It was done by the Avrille Dominicans, and both Bp. Williamson and those Dominicans were with the Society at the time. This was during the Papacy of Pope Benedict XVI.
"
Why the new rite of episcopal consecration is valid
Introduction
This comprehensive study was compiled to settle a debate that has been circulating in traditional Catholic circles. Some writers have examined the new rite of episcopal consecration and concluded that it must be invalid. Since this would cause manifest problems if it were true and due to the heightened awareness of such a theory, we present a study of this question concluding that it is valid."
https://sspx.org/en/validity-new-rite-episcopal-consecrations
I believe the New rites in general (true for Baptism, Holy Orders, the new Mass etc) are Valid but Inferior, i.e. they confer the essential sacramental effect, but less Grace, and much more weakly. Thus, to take Baptism, for instance, so long as the words "I baptize you in the Name of the Father and of the Son and of the Holy Spirit" are said when the water is poured on the head, the Sacrament will be valid, but when the exorcisms etc are abolished, the Power of the Sacrament will be reduced, and the Grace conferred will be less. Likewise, in the Priestly Rite, the essential form remains largely unchanged (except, as was noted, for the word "ut"), but, as Michael Davies docuмents in Order of Melchizedek, many of the Prayers surrounding the essential form have been removed from the traditional rite in the new rite, especially those relating to the essential Powers of the Priesthood, to absolve sins in persona Christi, and to offer Sacrifice for the living and the dead. Hence, I believe they confer the Priesthood validly, but less Priestly Graces.
Thanks for the article. Again, this is the kind of information (or even
assurance) that I was looking for.
I do have to wonder, though --- and this may be addressed in the article (haven't read it yet, give me a break, we slept in, I just woke up!) --- whether it would be
theoretically possible for the new rite of
episcopal consecration to be valid, but for the new rite of
priestly ordination to be invalid. (I refer to "valid" and "invalid" in and of themselves, as distinct from "intention" which can be loosey-goosey in post-V2 times.) The removal of
"ut" concerns me --- I mean,
what was the point? Why remove just one word? I have to suspect that this one word may have been removed with malevolent intent. To use a secular analogy, if you go in and tweak one little bit of computer code, you can bollix up the whole program. And there's the apocryphal story of Czech workers forced to build nαzι aircraft, and they would spit pieces of chewed-up cellophane into the molten metal to weaken it structurally. Again, that's possibly apocryphal, but the point should be clear.
Quite obviously, if --- just for the sake of argument --- a priest had been invalidly ordained, and were later consecrated as a bishop in the new rite, then he would not be a bishop, because you have to be a priest, to become a bishop. Or am I garbling something here?