If that’s true, then the case against the V2 rites is a slam dunk. They are positively doubtful, without question.
Yeah, this idea that you can have an ambiguous Rite that could be valid or invalid depending on some (unknowable internal forum) intention (as per Pope Leo XIII, despite the clown laughing above) ... this principle does not exist. Pope Leo even made a mention of ambiguous Rites in AC as resolving to invalidity.
SSPX invented this notion so they could justify having conditional ordinations (so as not to loose too many of the faithful to SVs or others) ... without having to say that the New Rites are outright invalid.
I find it morally certain that they are invalid. Pope Leo XIII taught that the removal of all references to the priest's power to offer the Holy Sacrifice so as to make the Rites not inconsistent with the errors of the "Reformers" indicates a non-Catholic intention of THE RITES. He clearly says that the internal forum intention of the minister is no something the Church judges or an judge. But the SSPX claim that, well, if the bishop / priest seem "conservative", then they have the correct intention, and their intention can somehow render the Rite invalid, something that Leo XIII explicitly rejects.