I don’t know that I buy it, but this reviewer is sure. And he makes a pretty convincing case.
Of course, it depends what your definition of “deep” is. God knows, compared to much of the shit the movie industry pumps out, Predator is solid gold. (Not just Hollywood, mind, I’ve seen plenty of shitty Italian, French, British, Australian, and Japanese movies as well.)
My suggestion? Read the article and consider its arguments carefully while you rewatch Predator. Deep or not, the movie kicks ass!