I think it really depends on what these "human-similes" actually are. Are they just humans with maybe a genetic defect or people affected some environmental poison that causes neurological damage? In that case, they're still clearly human in my opinion.

Or are they basically dumb monkeys that just look similar to humans (which of course means, they never were human to begin with, so this no longer fit's into the premise of the previous comment)?

I don't think that "intelligence" is that important of a factor when it comes to deciding which animals you can eat. It's really about if they are human or not. Like, personally I wouldn't eat the closely related monkeys, both, because I think they are kind of endangered and it feels a bit weird that they are so closely relate to us. But if there is a way to reasonably/legally eat monkey somewhere and people do it, I won't condemn them too hard for it.