SEO content is human generated slop.

Technically written by a human, but as part of an inhuman machine in conditions that can't possibly permit quality.

Probably worse quality than LLM slop, because it's written quickly by a non-expert and also less specific to your query.

SEO slop was just shot-gunned out based on stochastic beliefs about what kinds of things people in general might search for.

At least LLM generated slop doesn't pretend to be created by humans, and is specifically targeted to your specific question.