If you're in danger of death, from what I understand you are allowed to confess to any priest, or even a priest who is in schism or who has doubtful validity. From what I understand the only way you are not allowed to confess in a case of danger of death is that you are certain that the priest is invalid.
Stubborn's argument is that God would never put him in a situation we're the only priest he had available was an NO priest. Okay maybe, but that's a different question then whether theoretically, if that was the situation you ended up in, that you would confess to him.
Given that from what I understand the church has ruled on the legitimacy of giving a confession to a doubtfully valid priest, it would therefore seem that the church hasn't said the situation is impossible.
Now if you dogmatically take the sedevacantist position, and you definitively, 100%, believe that the priest is invalid then of course you wouldn't confess to him. If somehow I ended up in a situation where the only minister at my bedside was a Lutheran, I obviously wouldn't confess my sins to him. Instead I would try to make an act of perfect contrition and hope for the best. I KNOW He's not a priest.
But it doesn't seem that most people on this forum believe that. It seems that most people on this forum would believe that there is some doubt whether or not these are valid priests or not. I'm going to assume that despite his posturing, that this is technically the position that stubborn holds
As such, I honestly agree with Sean here. I think that is objectively irrational to refuse to make the confession to the NO priest.
The accusations against Sean that he thinks the NO is valid but just not as good, is kind of irrelevant here. It's irrelevant because we aren't talking about attending the new mass if that was the only mass that was available. We're talking about confessing our sins to a diocesan priest. And there, the only question that matters is whether it's potentially valid or whether it's definitively invalid. That's literally it. It doesn't even matter if they're Catholic or not. Church says you can confess to an EO priest on danger of death.