Simply not true.
Also - part of the intentional grounding rule is that if you are outside the tackles, the ball must go beyond the line of scrimmage. It seems in every single game I've seen Brady play in the last few years, at least once, if not multiple times, he throws the ball away when outside the tackles waaay before the LOS - with no receiver in the area - usually not even close. This includes tossing it OOB before the marker. I've never seen him called for it. It is actually bizarre how even when it is patently obvious the refs don't apply the NFL rule to him.