I’d say a coin toss between a troll just trying for “shock”, vs. some lone weirdo who really did a lot of online research on the Great Replacement and wants to use posters to get the word out.

I mean Her Majesty Queen Roman Dildo Romana Didulo I still rolls across the land, so I wouldn’t discount the legitimacy of the poster outright. Still, it is pretty rage-baity, so decent chance it’s just some trolling.