It's a puzzling situation: - The DDoS was certainly unethical and unneeded - Although the blog post only shows an extremely one-sided version of the story by skipping straight to the threats, there are reasons to think that diplomacy has also failed terribly - The website owner has all eyes of the "thought police" on them, and given the current political situation in Russia, it's more than likely they reside somewher…
I don't think that's on the table. I would say use this as your incentive to support archive.org, who has proven much more accountable. Archive.Today is weaponizing their traffic, and reducing traffic is the best way to deal with it. Vote with your feet.