I encourage you to have a look at Guillaume Chaslot's https://algotransparency.org - it identifies what videos YouTube's algorithm most often recommends, based on a given search. Serious question (I'm not trying to be facetious): looking at those recommendations, what do you think?

That is not proof. It's cherry picked topics for uncontrolled Youtube recommendations to a bot account they created. I think nothing about that is scientific and it screams tech illiteracy.