Not only that, it's wrong. I can have zero "conspiracy" videos in my history/cookies and still sometimes see recommendations for it. Granted it was worse years ago.
I actually like conspiracy videos (for fun), but Youtube did something a few years back so that they are recommended with much less frequency.
Also to get a totally clean slate, which is still not perfect as you said, you have to delete subscriptions and likes as well as watch history. I've tried it a few times, but since I keep my subscriptions I always end up back on the same topics.
