That was the point. In the books, the bugs had been flinging rocks towards the outer colonies for years, but the attack on Buenos Aires is heavily implied to be an inside job to rally support for an invasion, since they did not have hyperspace tech and no attack had reached the inner worlds, let alone Earth.
Maybe publishing houses will never get the memo, but the Helldivers team knew to make a fun game first, and THEN added amazing graphics. If the market prooves they prefer that dev cycle ethos, it will bring change.