It means no failed video. The algorithm could push something and there would be no way for users to see if it was received well or not. Youtube will know, they have watchtime etc.

This probably is good for sponsorship. Like the Abby Shapiro videos that were massively pushed through ads. But nobody liked them so they got a lot of downvotes.

Also remember this failed YT thing, Youtube Rewind? Next time nobody will know it was a fail.