Without location (or "remote" specified), this is almost 100% useless. Someone who is top 1% developer in Sudan, working for Sudanese companies will earn way less than even a mediocre freelance developer in a highly developed country.
How can you honestly be “best of the best” but be dumb enough to ignore remote work. Something you almost actively have to be doing these days and which, for this hypothetical person, has an insane payoff.
This person is supposedly both super smart but at the same time can’t even see the fruit that’s so low-hanging that it’s literally smacking him in the face.
But yeah, probably safe to assume USD, just playing devils advocate I guess.
Even so, on US-based platforms, like reddit or HN, USD is usually used as a "convertion unit" rather than a implication of location, I've found.