I assume any QB with half a brain wants the ability to call an audible. I cannot be certain, but I would bet that he could audible in some way, shape or form at both Denver and Vandy. And probably in high school. Most QB's do. Unless they are just pure athletes expected to run or pitch...
I've read the quote numerous times. I have heard it over and over on Comcast. It's painfully apparent to me that he is trying to call out the fact he cannot call audibles while trying not to call out Martz specifically.
I think his frustration is apparent, and related to a vast number of concerns, not just audibles.