There’s two things to unpack here.

The first is that all “AI” is not equal. It’s specifically generative AI that most take issue with, mostly due to questionable ethics in training. Image editors have employed techniques marketed as “AI” for many years that are mostly or entirely unrelated to modern generative AI.

The second is that whether something is “AI art” is a spectrum, not binary. On one end you have creations in which generative AI played no role and on the other you have images that were generated off of nothing but a prompt or vague scribbles. In the middle you have things like images where the artist traced over an AI image or used bits and pieces of generated imagery. Probably the closest shorthand for where an image lands on the spectrum is to what degree the creator engaged their artistic skills.

A great many of digital artists would be happy to use Photoshop 7/CS1/CS2, all long predating generative AI, if those ran on modern operating systems. Some prefer modern simplistic (and without AI) tools like Paint Tool SAI.