Hmm? Impressionism is noted for extreme lack of detail, that still is suggestive of something specific, because the artist knows what details your brain will fill in. (8bit pixel art is impressionistic :-) )

Yes, a suggestive smudge, a vague mark, as the artist in the article said (the one talking about the "ruined gate" picture). That's like an honest communication between artist and viewer, "this mark stands for something beyond the limit of my chosen resolution". It's like a deliberately non-committal expression, like saying "I don't know exactly, kinda one of these". In contrast, we have in AI art misleading details that contain a sort of confabulated visual nonsense, like word salad, except graphical. Similar to an LLM's aversion to admitting "I don't know".