It's a moot point, Pope Benedict XVI said in his motu that the the true Mass was never abrogated, if the true Mass was never abrogated, what makes you think the law of Quo Primum was abrogated? Just because Pope Paul VI ignored the law does not mean by that act the law was abrogated, it means by that act he broke the law.
Ratzinger said lots of things, including many that you would call heretical. But the question is whether a Pope COULD change the Canon of the Mass (per the Pius XII thread). Ratzinger was acting/playing "Traditionlist" precisely with a view to reabsorbing the SSPX, which I've been saying for years, and which Ganswein ultimately admitted, so he said lots of things to curry favor with Traditional Catholics.
You keep throwing distractions out there to side-step the main point, which is that St. Pius V also said that the Breviary he promulgated must be used "in perpetuity".