The doctors wouldn't necessarily be lying. The truth is rarely black and white. Given McCall has a broken ankle, it would certainly be reasonable for him to miss the remainder of the year. If Ferentz & Co. are getting along well without McCall, then the odds are fairly strong somebody lets McCall know that the team would like him around for four more years of playing time and a medical redshirt is in his best interest. So he tells the doc he's having ongoing significant pain, weakness and instability. As a result, the doc continues to restrict him from contact and full football activity.
Is it lying? Not really. It's playing the game. Is it that hard to think the docs at the UIHC would be influenced by the football program?