Then why were so many of the traditional offertory prayers retained? Remember, as you have pointed out, that the liturgical texts remained intact (since the doctrinal problems were mainly within the General Instruction). You simply can't get around the fact that the GIRM opens with a solid affirmation of Trent - of the Sacrifice of the Mass and of Transubstantiation. Nor can you get around the fact that the liturgy is clearly sacrificial.
Re: Ratzinger. For one thing, Ratzinger's theology at a private conference is not determinative of the meaning of the Missal. You are taking him out of context in any case - he ends the conference with:
Trent did not make a mistake, it leant for support on the solid foundation of the Tradition of the Church. It remains a trustworthy standard.
What do the opinions of a "sizeable party of Catholic liturgists" have to do with the meaning of the Pauline Missal?
How have the Offertory prayers been retained? What text do you refer to? The Offertory prayers have been eliminated. What you have in its place is an offering of gifts, works of human hands, etc. That is not an Offertory, it is the saying of grace before a meal, so to speak, little else.
"What do the opinions of a 'sizeable party of Catholic liturgists' have to do with the meaning of the Pauline Missal?"
Everything. They reflect the thinking of Bugnini's committee which shaped the New Mass. The New Mass, moreover, is incompatible with Trent. Hence the vitriol directed at the ancient Mass which, affirmed by Trent, is a living rebuke of Bugnini's fabrication.