That's a perfect example of the problem. It's overgeneralized to the point of meaninglessness.

It asserts that UPF is bad because they tend to result in quicker absorption, amongst many other things. So why not say quick absorbing food is bad for you, and why use a definition that also includes food that is processed to absorb slower?

Then repeat across several other characteristics. Few UPF foods will bingo on all characteristics and a lot of non-UPF foods will bingo on many of the same characteristics.