Do you have a link to the manifesto? I can't seem to find it anywhere. It's strange how little information is easily available on it; every article I see in search results is informationless fluff, with various attempts to spin something, but they're all so unclear on what the thing they're spinning is in the first place it comes across very strange.
To be honest I've always kinda thought how much things get censored is overblown, but damn, someone just killed half a dozen people (half of them children), injured hundreds more, and released a manifesto as to why they did it - yet somehow it gets buried. Instead there's an endless stream of speculation, blame, and talk about everything else. I don't think there could be anything in the writing that would concern me more than the degree to which it seems to be deliberately ignored.
Oh I'm four days late but yes. The YouTube downloader also downloads audio, I didn't realize they had a separate program that only downloads audio. Weird.