Interesting timing
All social media tends to skew one way or another. I tend to think of youtube as centre/centre-right due to the content and reddit/twitter as centre to hard left. It's not absolute of course - I'm speaking in general trends as I see it. And it's going to happen as they can and do all function as echo chambers.
What I am interested in is the timing of this "study". Almost as if something else involving another platform might have prompted it. Almost as if someone somewhere is concerned that the left leaning media are perhaps losing a little ground. Generally speaking nothing wrong with that as long as it hovers in the centre and doesn't go full on right-wing as much as it's been left wing in recent years.
Lastly: The title of this article seems a bit off, as if all youtube video are (queue the german accent) "You *vill* vatch ze right-wing video!" When of course that's not at all the case.
Ok, ok, that might be a over the top, but article titles can sometimes indicate the tone (and sometimes bias) of a piece.
Biting the hand that feeds IT
