[Avicebron]

Other than the pedantic both cured and fermented count as chemically preserved in a broad sense, I think the general modern understanding of "processed foods" means that "ultra-processed foods" per the webmd definition https://www.webmd.com/diet/what-are-processed-foods#:~:text=....

e.g. foods that are doped with additives that don't necessarily occur in the food's base state, including dyes, preservatives, added flavors generated in lab environments, etc.

To be fair I'm not advocating either way, since I'm sure I ate some form of ultra-processed food this morning just by having grocery store brand jelly on my toast, but I think the argument is that by mixing these into the diet frequently there are unknown long-term side effects on the human body by eating these in excess.