There's an episode where they find a huge underwater pyramid that has ancient Greek writing on it. A character gets possessed and starts speaking Greek. It turns out it's The Temple of Minerva built by Neptune. Now if you had a thing for mythology, like I did, as a kid you probably notice those are the Roman names of the gods. And Minerva is a black woman. This is in the early 90s.
This "replacement rot" has been going on for a long time
It's been going on since at least the 1960s and likely before that.
The Bill Cosby Show started airing in 1969 and while it's not explicitly replacement demonstrates that even at that time the media was pushing the Africans-are-just-like-Americans/Euros propaganda to national audiences with big money supporters behind it.
Thank you for this comment -- I was about to make the exact same comment. This has been going on since the 1960s. Most people simply did not pay attention. It started subtle and escalated rapidly after that. The unique slate of cool movies in the 80s helped bury some of the propaganda, but when Hollywood/congress cracked down on the "ultra violence" era at the end of the 80s, you could more clearly see the messaging rearing its head in the 90s and beyond.