I don't see the issue. Google is curating their platform and trying to remove as much un-original and reasonably offensive content. The doc also didn't seem to contain any political leanings or cultural shifters. I believe much of this is part of the service agreement on Youtube. Only issue I see here is the manual review process and subjectivity baked into that.
Completely disagree about there not being any political leanings. See the Controversial section here: https://i.imgur.com/vkBrkns.jpg e.g. religious videos of any sort are automatically deemed controversial (way more inclined to be right leaning), but videos about racial justice (left) are exempt (unless, of course, they are anti-racial justice videos, in which case they must be removed.)
You seem to come to this with a bias that Google is left leaning and why you see a political leaning situation here. I am a centrist and do not.