Sarcasm. I agree with Kelly but he shouldn't say this shit in the public, even if it's true. He should be selling his former players regardless of their decisions. The players will like him a hell of a lot more if he all he does is praise them in public like Dabo. BK has enough of an image issue already without this shit. He just comes off like an asshole here.
But then again, let's say Kizer goes to the NFL and sucks. Then Kelly's word/opinion is going to be tainted, and then when Wimbush leaves for the NFL people will take Kelly's word with a grain of salt even if he truly is great. You could say that being honest and straight forward has it's benefits and will help out future prospects.
If you argue that GM's could care less about what coaches say, then all of this has much to do about nothing and we are arguing for no good reason.
Now, if you want to argue that the mantra "If you have nothing good to say, don't say anything at all" applies here, then I wouldn't argue that. But I think if I was a player, it's nice to know that NFL GM's will believe a coach is being honest, rather than BSing me all the time. And as a player, I would just work my butt off to be a great player that garners Coach Kelly's praise. That's a recipe for success.