No, but he DID speak. This theory is the dumbest theory I've seen coming from someone who should know better for years; it's already been disproven before the dumbass thought of it.
Other apes have language. Prairie dogs have language. Even dogs have language, even though the only three things they say are "I'm hurt", "I'm lonely" and "get off my property before I eat you!" Previous STUDIES have shown this.
Why do these educated morons think vocal cords evolved for in the first place??
Also, the summary is likewise retarded: "If there's one thing that distinguishes humans from other animals, it's our ability to use language."
We may use it better than other species, but this is unproven; whales and dolphins may have more sophisticated language than us, but we can't tell because we can't understand them. It may well be that we're the only species to have abstractions, but that's not proven, either.
Tools aren't even human-only; birds and other animals have been spotted using tools. So what makes us different?
Music, art, and humor. No other species laughs (Hyenas' "laughs" aren't from humor); no other species make art (the elephant doesn't count; do you really think he knows what's going on?), and no other species makes music -- and no, bird "song" isn't music, it's speech (that the idiots coming up with this absurd theory don't understand).