Sadly, this doesn't mean anything. Executives can't and won't share highly confidential future plan data with non-executive employees who don't immediately require the knowledge, because if even one of them leaks that info, it can (and in this case, certainly would) tank their stock price.

Stopping production is not a plan that requires years of dev work to do, it's something that they can announce at any time and put into practice almost immediately, so they can and will claim (even internally) that Xbox is not going away right up to the moment they publicly announce they're killing it.

I love Phil, but he doesn't have the influence within MS to single-handedly save Xbox if the larger company leadership decides to kill it.