I would use the language "doubtfully valid" rather than "invalid" until such time that a restored Magisterium rules on the questionable nature of the 1968 episcopal Ordinale.
I agree with this sentiment. Especially because as laymen (and please correct me if I'm wrong) with no teaching authority in the Church, I don't know if we're qualified to say whether a rite of the Church is valid or not. Doubts, yes. Not only in the language of the Rite, but how they're presented; not as celebrants of the Holy Sacrifice, but as presiders of an assembly. But to claim it as invalid, I don't know.