As far as I know the ruling specifically applies to cases where there there is no human involvement whatsoever, since copyright can only be granted to human authored works. If something has an element of human involvement it may be copyrightable even if generative tools were used in its creation.

It's not some sort of "anti-copyleft" deal where a single generated commit somehow nullifies the copyright of the human-authored parts. It's kind of a trend among slop-detractors to act like this is the case (that a single piece of generated text somehow turns the entire project into slop) but there's no legal basis for that I think.