just like pretty much every other TF story, this is it's own unique continuity. It isn't a prequel to G1's TV show or comics, without some major issues (not that either of those didn't contract themselves from time to time) and while it might be a lead-in to Prime or whatever, it doesn't need to be, and the Exodus tie-in novel to the game itself seems to be a slightly different continuity.
Basically, don't worry about it too much.
assembling a Neo-G1/TF:TM cast. Please PM if you have (or know of) the following at a reasonable price: Classics or Henkei Astrotrain, Ramjet, Sunstreaker, Sideswipe, Blurr, or 3rd Party Motobot Arcee, iGear Ratchet and Ironhide.
Also looking for Universe Repugnus and Overbite, Frostbite and Longhorn and any Webdiver toys.