Oh I know who he is, and isn't, I was there at the time! :)
The timeline of the future Guardians of the Galaxy has long since splintered off from ours, especially since Vance became a hero in his own right in the present day, the Guardians Vance was never Marvel Boy OR Justice.
My point still stands that if this Major Victory IS the Vance from the "thousand years in the future Guardians" then the phrasing is wrong.