>>28672145I fully believe the leak at this point, but to be fair, the leaker was mistaken. What was described in the leak and what we got are close enough, though, for everyone to go along with it.
While "simian" clearly suggests "monkey", you gotta realize that "Prosimian" is the name for the group that includes lemurs and lorises. In fact, lemurs (and the broader Prosimians) are considered primates anyway, but distinct enough to not be considered monkeys.
It's incredibly common for Pokemon to be based off multiple things, of course. However, going by Passimian's color, the color and shape of its tail, and the shape of its feet, it's definitely a lemur, and not a monkey.
EVEN SO, leak is still legitimate. The confusion is understandable and it was right on multiple earlier points.