No, the archive.today (and .ph, .is, etc.) operator configured their nameservers to return invalid responses to Cloudflare's 1.1.1.1 resolvers because Cloudflare doesn't forward EDNS client subnet info (for the privacy of their users). The operator claims to need this information for load-balancing but I don't buy that argument.
As far as I was aware, their issue was resolved, but sometimes I still see failures so I don't really know.
Also, "US-mandated DNS filtering" would be a violation of the 1A except in narrow circumstances (which don't exist here) so I'm not sure that that should be your first thought...