Well if in fact he is tweeting false info then I would loose all confidence in MS. I would not upgrade and more than likely start using Linux again. I guess his Tweets are a tad vague .
He's not tweeting false info, he's tweeting incomplete answers to questions. Rather than writing a book about all the caveat's, he just says "yes" or something equally terse. That's what Tweets are, terse.
I'm sure his job does not consist solely of answering tweets. My guess is that he doesn't have much time for this, which is why he seldom says anything.
MS would do well to dedicate a person in the know just for such relations with general public. A little knowledge can lead to big confusion and that's what is happening right now as far as I can see.
On the other hand, MS didn't write anything in the stone yet and there might not be clear answer to those kinds of questions yet although I wish they had made my mind already.
He might mean that Insiders will continue to get updates but The Preview will still expire on 10.01.2015..?