Yes, the A/B/C test features, or "a/b" for short, comes up when you upload a vid, and it tests up to 3 thumbnails and 3 titles.I think it's been mentioned before but isn't there some feature in youtube studio now that he can use up to 3 different titles (or more) and depending on what type of device depends on what title you see?
The A/B test Ai can suggests the titles by scanning the transcript and analyzing it.
Youtube's native upload ai scans the video of best thumbnail use, you can upload your own custom thumbnails.
So he's f-ing around with these terrible generated thumbnails while the system is f-ing around with the titles.
But, and that's a big butt, he can stop the a/b/c test any time and start it over with another set of 3 thumbnails and titles.