The actual article is hilarious: https://web.archive.org/web/20220920184537/https://www.mrctv.org/blog/racist-hulu-dramedy-reservation-dogs-depicts-white-people-removed-crackers
In the episode, the tribal officer (Zahn McClarnon), who goes by the name “Big,” accidentally ingests hallucinogenic drugs along with his friend “Kenny Boy” (Kirk Fox). As they stumble through the forest and experience hallucinations, they stumble upon a disturbing initiation ceremony involving white men being intimate with beheaded catfish. Because, as the show so often says, “white people":
Kinda makes me want to watch it now.