I'm not the one preserving the word 'remix' in this context, I just wanted to put it in the terms that GP was using. It certainly sounds more absurd when you use that word.
But the point is that human creations are always based on something else, so pointing out that AI is basing its output on a database of previous work does not necessarily mean that it is not creating new art, or being creative, or however else you want to put it.
It's like the ridiculous lawsuits that claim a song is stolen because it uses the same chord progression as an older song, where there are almost always centuries-old examples of that same progression from Beethoven et al.
Your point seems to be that the reasoning is absurd because it's defending an incorrect premise, and the premise is obviously wrong because the reasoning is absurd, so I'm not you'll want to know what the people on the other side of this discussion think.