Doesn't seem like anyone here is talking about exactly what ads these are, but as far as I can tell, these are banner ads for YouTube TV's NFL Sunday Ticket that show up on the home page when you are browsing for videos. To me, this is about as annoying as a recommendation I don't want, and I get plenty of those, especially for news content when something happens.
The headline (YouTube Premium Showing Ads) makes it sound like if you pay for YouTube Premium you are now getting ads in videos just like normal YouTube, but maybe a little less, but this does not seem to be the case.