They were being review bombed by racists, and that was after most of the critic reviews came out, so your theory doesn’t make sense.
The problem with something like Rotten Tomatoes is people see an 85% and think the show was beloved. If you look at the actual reviews, most of them just say the show was just ok, and RT counts that as a fresh review.
If I didn’t care about LOTR, I’d probably call the show “just ok” too.