Probably. I remember the interview with Perrin and Walt seemed a little put out by the last minute cancellation. It was Perrin that said Huerter went home to talk to his parents about making a decision. But then there was a follow up questions about bringing him in later and Perrin said something like they had film if needed and had seen enough of him.
What I'll bet happened is exactly as you surmised...Huerter wanted to hide his injury. He may have thought it was something that wasn't going to require surgery until he got home and had it looked at by a doctor. Still, that sends up a red flag to me that he wasn't honest.
If this were politics, then technically he didn't lie. He did go home to consult with his parents. No one asked him about an injury and he didn't offer that information. So according to Trump or Clinton standards, he was 100% honest.