That's no different from saying all art/music you enjoy comes from the other art/music the creator stole for inspiration. Nothing is derived from a vacuum.
You also make it sound like using AI takes no work or effort. It, also, doesn't work in a vacuum. You need skillful prompts to get anything of value, and oversight to ensure it's of appropriate quality. It's less work and effort than not using AI, but that's the whole point.
Some people will, but that's the same as saying "Every non-straight person should be outed, because people will still like them" completely ignoring the hate that those with irrational abhorrence will target them for being open. If you don't want to face that animosity no one should be forcing you to.
And if the argument is that AI is low quality, then you shouldn't need to disclose that it was used - it will be self evident, if that argument holds any water. The closing argument is that all creations should be judged based on their quality, not based on prejudice of the tools used.