A "processed" food is simply one that has any amount of added salt, sugar, or fat. Many snacks include seed oils, I'm sure, but "nearly all" processed foods certainly do not.
https://www.hsph.harvard.edu/nutritionsource/processed-foods...
https://www.hsph.harvard.edu/nutritionsource/processed-foods...
By all means, focus your ire on snack foods. Or seed oils. Or whatever the latest trend says is unhealthy.
My point, every time this comes up, is that "processed" is uselessly vague, unless you really do believe that adding any amount of salt/sugar/fat is harmful to human health. I believe that many people using the term do not actually know its definition and merely use it as shorthand for some nebulous set of foods they believe are "too artificial", without seriously considering which aspects of those foods should qualify them for inclusion.