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 Prowl, Astrotrain, Ramjet, Skywarp, Sunstreaker, Sideswipe, Blurr, Perceptor, GDO Wheelie and Springer, or 3rd Party Motobot Arcee, FP Springer, iGear Ratchet and Ironhide, City Commander (and/or Ultra Magnus), Starscream (deluxe) Coronation add-on, or Spike and Daniel in their Exo-Suits.