Well, no, it isn't, but then again there's nothing disputing it either.
Basically, it could be the official canon, but until someone actually comes out and says it is, it isn't.
And while Toriyama did have input in the game, he didn't write this timeline or the game itself, so that as well puts it in dispute.
--
Will not remove this line of my signature until the Seahawks, Jazz or Rockies win a title (Started 5-16-09)
SuperNiceDog: Guru winner