Later he complains about how Americans "overconsume hyperprocessed foods" without further explanation.
Is there any evidence or even a credible physical hypothesis why fast food processed mystery meats would be meaningfully less healthy than the roughly similar unprocessed cuts from the same animal?
A hot dog is going to be both high in Sodium nitrite and AGEs for example.
One way to negate this hypothesis would be to show that the accumulation of exogenous AGEs is insignificant compared to the endogenous production of AGEs. I'm not knowledgeable enough on the subject to say if this has been studied.
It's thought to be because of the preservatives and other chemicals. If you look at studies of meat eaters vs vegetarians, vegetarians tend to be healthier. But once you correct for differences in processed meat consumption the difference is much less large. (At least according to Michael Pollan in In Defense of Food.)
The typical processed meat product contains additional ingredients that are not just meat. Particularly nitrates and added sweeteners.