My comment wasn't about the Bills/Vikings game, actually. It was just about the annual "vanilla" excuse. It happens every pre-season that there are posts of the "don't worry, they game planned and we didn't" mental pablum.
How many NFL coaching staffs honestly game plan pre-season games? None, these days. (OK, Jimmy Johnson did it his first year in the NFL.) I don't see any teams playing their starters for 4 quarters. It laughable. Do they stay up late worrying about how to attack the 4th string secondary and what it's weaknesses in coverage are to win one for the Gip in the last 2 minutes? Of course they don't. Running a couple of gadget plays in a preseason game does not constitute real game planning.
PS: It is preseason, it doesn't count, and the overreactions are customary.