I think you mean "anything UPF-GF or UPF-vegan is UPF". The Typical vegan and GF foods you find in a supermarket are just the same as others foods:

   - non processed: fruits, grains, roots, leafs, pulses
   - processed: pasta, breads, nuts milks, sorbet, fries
   - UPF: most drinks, most sweeties, most prepared food

Some exceptions exists but don't change the general trend:

   - vegan burger: some are UPF, some are just smashed fallafels
   - GF bread: rice or rye bread suits most gluten intolerants. Those suffering allergies have limited options obviously (which include abstaining from bread) but their medical condition isn't a "gluten free trend".
   - meats cuts: some contains sodium nitrite and other nasty additives while others are just raw animals parts.

OK but that's a very small proportion of what the typical supermarket has on sale.