You don't understand the difference between personal faith (i.e. membership) and sacramental validity (comes from the Church).
Okay, I didn't know that, I stand corrected. So that was the reason why cardinal Lienart validly consecrated archbishop Lefevbre, even he was public heretic and most likely a freemason. If that was the case, then all this attack on archbishop Thuc is pointless. Same is with cardinal Siri, he also said the New mass, but he was still an archbishop and could ordain priests which he did. I believe he was under constant threats, surveillance and he was elected and accepted the election in 1958. before Roncalli.
But that is another topic....