It's literally replacing every single swiped word with the "soft n-word." Every word, including things like "the" and "top".
This is happening to me right now on gboard, most updated version of Android, running on a Pixel 5. This has happened before and y'all gotta take my word for it that I haven't done anything to teach my phone that that's what I want to type.
Shit that's awful.
The worst thing my autosuggest does is try to say "Happy birthday" at the start of every conversation and try to call everyone sweetie when I'm trying to say goodbye (I have never called someone sweetie).