I'd say Greg is probably pretty in tune with what Matt Rhule is doing here given his Carolina connections. Plus, he knows what Cam really thinks about this joke shop.
and I think it was reported early that one of Rhule flaws was wanting to be too in control of every aspect of things.
So even if Greg isn't specifically talking about Rhule with the line of not telling....it sounds like Rhule is that type HC he is referring too. For example, Rhule threw Cam hard under the bus for merely taking the built in audible on that 4th and 1 play. Per Rhule, that should of never happened. A vet and former MVP that knows short yardage as good as anyone....should of never audibled in that scenario per Rhule. And it was built into the freaking play. That just screams what Greg is talking about IMO.