There are quite a few problems with all of those movies, but that's hardly important. Though, the alternate time line creation explanation is valid. Though, so as not to hijack this thread, I created a discussion thread for that here
And, really, changing one of Puto's moons' names to Vulcan changes nothing. It's not any different than getting them to name a space shuttle Enterprise. (and, coincidentally, the one that couldn't actually go into space
) It's just Trek fans having a bit of fun. Besides, the Vulcan name in this instance comes from Roman mythology, all of the name suggestions were from Greek or Roman mythology. It will be interesting to see if they actually name it Vulcan, since it won the vote.