"F5 announces hack by foreign country" (or the infinite variations of) is less silly than "F5 announces attack from nation-state hackers", you're just used to hearing the latter repeated every incident. Anyone can intentionally use a phrase poorly, pointing out a silly sounding phrasing exists adds nothing.
Not that "F5 announces attack by state sponsored hackers", "F5 announces attack by nation-state backed hackers", or "F5 announces attack from nationally backed hackers" have to be invalid, particularly since the latter is often what is actually most specifically correct anyways.
