[gbcdoj]

New rite accrd to Quo Primum

"New rite" is not in the Latin original of Pius V's bull; it was a "dynamic equivalence" translation.

[bornacatholic]

I'll stick with Fr.Jungmann's Liturgical History of the Roman Rite as authoritative - he says Quo Primum was a new rite also - rather than take the unsourced opinion of a layman; that is if you are a layman

Una Voce has Quo Primum on its website. It reads...

This new rite alone is to be used unless approval of the practice of saying Mass differently was given at the very time of the institution and confirmation of the church by Apostolic See at least 200 years ago, or unless there has prevailed a custom of a similar kind which has been continuously followed for a period of not less than 200 years, in which most cases We in no wise rescind their above-mentioned prerogative or custom.

You will be busy correcting a lot of folks :)