That confuses me too. I've never really understood that. Likewise, /m/news is for US news while world news goes into /m/world and US news isn't allowed.
Maybe that's another reason why folks thing it's US-based - because the magazines are clearly so US oriented. But I'm not sure how that happened.
On the brain bin for example it's PoliticsUSA - https://thebrainbin.org/m/PoliticsUSA
Ah, that makes sense. So the FediDB info seems to be wrong - I wonder if they got confused by cloudflare as per the other comment in https://feddit.org/post/4529920/2993842 ?
Also, is there a way to let them know to update it? I guess someone could report an issue on github...