Eh, I dunno. I deadlifted 550 lbs as a 215 pound wussy freshmen in HS (and I'm not terribly athletic). The deadlift is a surprisingly easy lift, if your grip is good enough. If he was, say, clean and jerking 300+ at that age...well, I'd be really goddamn impressed.
That being said, Whiting definitely looks like he's got the most college-ready physique of the incoming linebackers. I think Klein's early admission will give him a leg up, though, not just from a conditioning perspective but because he'll also get a chance to go through spring practice. I think that will be huge in determining play-time.