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I suspect that the overall premise of the paper is correct, but it's interesting that they repeatedly reference lists of what they call "problematic" right wing categories such as “IDW,” “Alt-right,” “Alt-lite”, “AntiSJW”, “Conspiracy”, “MRA”, “ReligiousConservative”, “QAnon”, and “WhiteIdentitarian” while they seem to only recognize a single category as extremist left content: the "Socialist" category.

If you're specifically looking out for a long list of right wing extremist content categories, but only one category of left wing extremist content is there any wonder that you'd find that youtube pushes people to extremist right wing stuff to a greater extent than they do the extremely limited left wing extremist content being considered?