Interesting.
But since the EF is celebrated according to the 1962 missal, then that is what is read.
What you quoted in your OP is the 2008 revision. You can recap the entire history of this issue
here, although Wikipedia is not correct that the term
perfidis “did not mean perfidious but rather ‘unfaithful, non-believer.’” The definition given in the Oxford Latin Dictionary of adjective
perfidus, runs, in its entirety:
That deliberately breaks faith, treacherous, false, deceitful.
b (transf., of material things).
c (of actions, words, etc.) marked by treachery or deceit.
And similarly
Lewis & Short has:
I.
that breaks his promise, faithless, false, dishonest, treacherous, perfidious.
I. Lit. (class.; “syn. infidus): vanum et perfidiosum esse,” Cic. Quint. 6, 26: “omnes, aliud agentes, aliud simulantes, perfidi, improbi, malitiosi sunt,” id. Off. 3, 14, 60.—
INDENT. With gen. (poet.): “gens perfida pacti,” faithless, Sil. 1, 5.—
b. Of inanim. and abstr. things (poet.): “bella,” Sil. 15, 819: “nex,” effected by treachery, Sen. Agam. 887: “arma,” Ov. F. 4, 380: “verba,” id. R. Am. 722.—
c. Adverb.: perfidum ridens Venus (= maligne ac dolose), Hor. C. 3, 27, 67.—As subst.: perfĭdus , i, m., a scoundrel, Juv. 13, 245; 9, 82.—
II. Transf.,
treacherous, unsafe, dangerous (poet. and in post-class. prose):[/INDENT]