You won't tell from the music. It's obviously an AI generated mix when:

- the channel posts multiple mixes per week

- the thumbnail is clearly AI generated

- most importantly, the tracklist never includes any author, because there are none

If you search for "<genre> mix" on YouTube right now, 9/10 results fail these criteria.

Lo-fi channels used to show the artist and song names. These newer ones don't bother with credits, or have made up song titles.

E.g. "funky chicken jam"