I'd say a lot of people even have an incentive to not give credit to the LLMs, because there is a social stigma associated with using AI, due to its association with low-quality work.
I'm guessing the music business right now is absolutely awash with unreported and uncredited AI lyrics and backing tracks. It's an area where you can get away with it a lot easier than in the visual arts.
People are delusional. There’s a large cohort of folks on HN who still think AI is just a stochastic parrot. Depending on the topic or the thread you’ll find more of those people and get voted down if you even imply that LLMs can reason.