Given that archive.is is known to DDOS and alter archives (See all the recent HN posts about them)
You can blame whoever you want.
The concern is that he’s shown he’s not a trustworthy archivist.
[1]: https://help.archive.org/help/how-do-i-request-to-remove-som...
I even think what archive.is did to their detractor was understandable - in poor taste, definitely black hat, don't do stuff like that, immature as hell, but hey, I get the human impulse that led to the bad decision, and I'm not gonna base whether I use the site or not on that.
There are also many web sites that provide an onion address in addition to their clearnet address. For example, the BBC: https://www.bbc.com/news/technology-50150981
Public key obviously, not private.