Well, as for XWA, may I remind you it's a space sim. It simulates the battle in the manner of "what would happen if you were a great pilot and you do so well YOU would be elected to lead the attack on the DS2". That's basically what all simulation games do, even the board games that replay historical battles. So that's legit IMHO.
Actually, at base, there is nothing to seperate the games from the books, officiality wise. They all tend to go through the saem purpose; much of the basic XWA plot is now considered part of the EU canon, ditto for Kyle Katarn (soon to get a third outing! Woo-hoo!)
It just happens that, even more so than the books, the games tend to mess up continuity.
As for GL's interviews, technically speaking, yes, they are.