The site started doctoring archived versions as part of the petty feud. That is, what was supposed to be a historical record, suddenly had content manipulated so as to feed into this fight[0]. There is no redemption. You want to be an archive, you keep it sacrosanct. Put an obvious hosting-site banner overlay if you must, but manipulating the archive is a red-line that was crossed.
...On 20 February 2026, English Wikipedia banned links to archive.today, citing the DDoS attack and evidence that archived content was tampered with to insert Patokallio's name.[19] The decision was made despite concerns over maintaining content verifiability[19] while removing and replacing the second-largest archiving service used across the Wikimedia Foundation's projects.[20] The Wikimedia Foundation had stated its readiness to take action regardless of the community verdict.[19][20]
[0] https://en.wikipedia.org/wiki/Archive.todayWhile I disagree with that action I still trust the site as a reliable source. Redemption is possible. Maybe not for Wikipedia, but I don't care about that site and consider it rotten.
That line of argument is rather misleading, as some kind of content manipulation is inherent to the service an archive that violates paywalls has to provide. It needs to conceal the accounts it uses to access these websites, and their names and traces are often on the pages it's archiving.
Did AT go beyond that and manipulate any relevant part? That's rather difficult to say now. AT is obviously tampering with evidence, but so is Wikipedia; their admins have heavily redacted their archived Talk pages out of fear one of these pseudonyms might be an actual person, so even what exactly WP accuses AT of is not exactly clear.