Well, the channels are still there, the list is just not updated anymore. For now links from the commit before they were removed should still work

https://github.com/iptv-org/iptv/blob/aafbe73e8aad84931983cb530aa1f9570c67879d/streams/us_adultiptv.m3u

Raw version

https://raw.githubusercontent.com/iptv-org/iptv/aafbe73e8aad84931983cb530aa1f9570c67879d/streams/us_adultiptv.m3u