No, no, you weren't mistaken, they changed it to global only recently!
Anyway yeah, I agree, getting 40k views with just 1000 readers doesn't sound very realistic. The only way I could see it working was if you had some staff pick of sorts and/or if you updated during one of those Canvas Marathon thingies, since both can give you a pretty huge boost in views/subscribers. The good thing is that, as @rajillustration pointed out, you apparently don't need to hit 40k views every single month after you activate ad revenue, so there's that, at least
Either way, I'm still VERY far from reaching that goal, and even if I were to reach it, I still have no idea whether my comic is too "scary" for Webtoon standards and if they'd let me activate ad revenue in the first place XD