DCMA would not work here since they are hosting a copy of it for archival purposes, and not claiming copyright. The original public URL is included.
Archive.org does respect robots.txt tho. It is possible to completely delete a site's history on Archive.org by modifying the robots.txt (at least in the past, not sure if that is the case now)
I wonder if the do some kind of DCMA thing automatically for urls on their website, to have them removed from the wayback machine?