Being deaf and mute doesn't imply lack of language. But being unable to communicate absolutely strikes me as non-human.

Ok say you grew up alone in the woods, are you no longer human? The capability to learn language is no doubt unique, but language itself isn't the basis of intelligence.

> Ok say you grew up alone in the woods, are you no longer human?

No. You are not. You are a hairless, bipedal ape.

> but language itself isn't the basis of intelligence.

Intelligence is an illusion based in language. Without language, intelligence is meaningless