I think what ND's statement was clarifying that Neil and Bruce weren't responsible. Evans and Balestra run ND. If anyone fired someone as high profile in the company as Amy, it would be those two not a game director and writer.
I'm not saying egos weren't involved, or if there was some internal strife that lead to this outcome, but Evans and Balestra would be the ones to make the call.
What transpired between Amy and ND is none of our business, which is why I think the statement from ND was vague. We don't need to know the particulars and every "juicy" detail. Feel free to imagine all sorts of raised voices, curse words and tears, but know that you'll never know what happened behind closed doors, and you don't have to know.
I'm sure many of us wouldn't want every detail of our lay off/firing known. It's clear Amy more than likely was let go, and didn't leave on her own accord, or they'd have said it. Just give the woman, and by extension, ND, sone respect and privacy. I'm sure nobody is happy at this outcome. Hell, we had to let 5 people go last week, a few who have been with the company for nearly a decade, making games and building the company to what it is. Everyone was upset, not just the affected parties. These things happen in the industry all the time.
EDIT: NO, it's not any of our business. Just because someone is in the public spotlight doesn't mean they owe us anything in regards to their lives. They aren't obligated to inform us of every beat and tick of their existence. In short: we don't own them. They dob't belong to us, and it's just a little bit disturbing that some people think they are owed an explanation because she happened to be involved in some entertainment they liked.