It really isn't that difficult: You don't *need* to implement this complicated systems to remove sharing, remove embedding, post sources on the topic of videos, etc.
You just need a team of a few hundred people at most to go through the top 2 or 3% of the most popular conspiracy videos, extremist and nazi stuff, etc. Just a team of people going through the most popular and going "Boom, video is gone, account is banned, no recourse" would absolutely KILL the algorithm for any other videos on those areas because it really does chain up to the popular videos.
They just gotta want to say "We don't want Anti-vaxx money" for example. All of this other complication is just this nonsense of "Many sides, gotta listen to all perspectives" and many other such centrist talking points because as I said, conspiracy theory content does makes youtube a lot of money and brings in a lot of people into the platform (Even if technically those are not monetized)
So this is just Susan and her team trying to dance around how appear as if they give a crap about these issues while not cutting off a major part of the audience and of the advertising money their algorithm created unsupervised. Purge is not as difficult as they make it out to be, it just hurts financially.