No. He knew exactly what the question was about, and what it was regarding. Their was no misunderstanding there. He didn't appreciate the word choice because characterizing it as a security issue implies certain things. But no, he knew exactly what he was being asked.
Sure, the initial question was poorly worded, but he's not a stupid man.
He may not be stupid, but governments harass companies all the time and put them into situations they don't want to be. RIM is not special, and being in an interview you get asked questions you don't want to answer. He definately could've played along and answered it. But that may just be my Dutch/European directness.
Sure, the initial question was poorly worded, but he's not a stupid man.