Well duh. Any platform that allows people who hold fringe beliefs to connect and form community will do that. I'm not sure why thats either surprising or bad
Just note though that the sample size here is "The study involved interviews with 30 attendees at two conferences. "
This article is just part of a coordinated media cavalcade, accelerating in the last few days, to attempt to justify, and promote censorship by the state - to shut down dissenting opinions. See it for what it is, a crude propaganda effort, by those in power, who feel threatened by alternative media.
Buddy, it ain't state censorship if YouTube isn't government owned. It's actually not even censorship at all when the videos in question can still be linked to or found via the search bar.
Removing a video from the "Recommended" sidebar does not represent a crisis of free expression.
It's social engineering
Free speech is being able to say what you want (as long as it isn't screaming fire in a crowded theater or yelling in a library or such like these) without consequences. A society where every website bans you for believing X but yhe government doesn't throw you in jail might respect the first amendment, but it doesn't respect free speech.