Offtopic, but what's with all the PGP signatures? One message is literally just "this message is signed with my key", followed by a key and a previous key. Is this a meta joke, automated signing (like signed emails), or am I tripping?!
Using a non-repudiatable signing system to promote claims about how a proxy is easy to detect comes off as very hinky to me, to use a technical term.
Account security with 2FA is a long way from foolproof. Accounts get compromised all the time, especially by phishing or malware.
That's why my company's internal emails are all PGP encrypted and signed, even with managed accounts and YubiKey authentication.
When it really, really matters, you need more than 2FA.
Edit: Like, if I had hacked one of their accounts, what's keeping me from commenting there and just copy-pasting the key they used before, or generating a new one? Are they going to check?
If at any point in the future, someone wanted to say, "Well, so-and-so may not really have been the one who posted it," or, on the other hand, one of the signers later wanted to renege and say they didn't really sign it, it's going to be a lot harder for anyone to buy that the account credentials and PGP privkey were stolen and used than just that someone somehow spoofed a post from an account.
It's like the difference between posting a +1 retweet and having a signed document notarized. One of those is a lot harder to claim was faked/unauthorized later.