It’s hard to know for sure. If LaVine, the former UCLA guard, did say that when he was picked no. 13, you can’t really fault him for thinking it (mouthing it, though, is obviously a whole different matter).
Update: Not exactly a denial:
Bill Duffy (LaVine's agent) via text on Zach saying, "Fuck me." after being picked: "He's all good. He was just expressing relief." #twolves
— Darren Wolfson (@DarrenWolfson) June 27, 2014