Belichick addressed this. It was post the memo in 2006 that Patriots cameramen were ejected. Certainly Matt Walsh never was. What I want to know is this: were Patriots camera guys ejected before 2006? Because if they were, then maybe the league did recognize the rule as Goodell interpreted it.
But if they weren't ejected before that, then it seems to me that the rule was as Belichick said. Why start ejecting people in 2006? In other words? Why issue a memo if the rule is clear?
Regardless, in the Keteyian interview, Belichick was asked if he agreed with Goodell's actions. Belichick responded: "It's irrelevant what I think." Belichick said it was the commissioner's responsibility to make those decisions. He culd have easily issued a mea culpa there, but essentially he said that what he thinks is irrelevant. AFTER he made that comment he contested the value of the memo, he contested the wording of both the memo AND the actual rule. He even made it clear that the mistake he personally made--the only mistake--was not seeking clarification from the league.
This is the precise reason why Peter King and the like are piling onto Belichick, because the interview made it clear that he feels he's in the right.
And I agree with him.