Nothing illegal about it. There may be regulations which prohibit having alcoholic beverages which have not been served by the crew, but if the crew are prepared to serve the alcohol to the passenger , then it is fine. There is nothing to say that the crew will agree to do it.

As far as change of vintage goes, Is it not just that they have been serving 2000 for a few years now and they are now just moving on to the 2002 since 2002 is just the next vintage after 2000. It is not as if they are going to a worse vintage