That's a load of nonsense if you ask me. The best players train, harder than most. That's how you get to be the best. Ozil is talented, but no longer a great footballer if you ask me, and I have absolutely no problem whatsoever with the decision making around him at the moment. He's been ineffective in almost every game he's played this season, and it was a team built around him that failed to qualify for the CL multiple times. I don't care about his contract, when it comes right down to it. I'd rather cheer on Iwobi at this point than a lackadaisical, entitled, disinterested prima donna, no matter how talented.
If that makes me old fashioned or out of touch with the reality of football, I don't really care. If Ozil doesn't want to work hard to earn the shirt in every game and in every training session, then he shouldn't be on the pitch. There's more to football than that.