I'm not sure how much of a deal this whole issue is. I think it's poor sportsmanship, but I wonder how much it really helped them.
Look at it this way.
If you knew exactly what kind of formation the defense was going to line up in; where the blitz was coming from; zone vs. man; what each audible meant; etc., you don't think it makes it much easier to call "the perfect play" on offense to counteract what the defense it doing?
And now, switch that up. Your defense vs. their offense. How tough can it be to play defense when you know where the play is going and who's getting the rock?
The old expression, "it's like they were in the huddle" carries a whole new meaning now.