Tornielli: “Peace” agreement reached between Vatican and Lefebvrians

[Vetus Ordo]

It actually is very easy to prove the validity of the NO Mass; if the correct form and matter are used.

You're forgetting intention.

Correct.
I am sorry.
But you cannot mindread the intention of the priest at the NO or the TLM.
This is not the faithfuls fault.

The whole NO system undermines the priest's right intention. That's the purpose of it.