It really is the social media equivalent of white folks telling Black folks that Boston is less racist than the South, and completely ignoring any Black folk that live in Boston or anywhere else in the US trying to talk about what their real, lived, experiences have been.
Many Mastodon users are just completely convinced of the superiority of their moderation philosophy, and they are as happy to ignore the few Black Fedi users in 2023 as they were in 2017.