This has no bearing on the argument. That is just as true of vegans who purchase boxed products.
It's also fairly US-centric. If you observe countries with the longest lifespan, lowest CVD incidence and overall best health outcomes, they consume a more varied whole-foods diet with animal products.
> the classic diet
This is the Americanized diet of ultra-processed foods. Whole foods are the solution, which is in no way shape or form contingent on whether animal products are included (unless the diet is "carnivore" which is not representative, and even there you can find traditional societies who fare ok even if not completely optimally).