As per the lore of Starship Troopers, yes I’m sure. There is no evidence even slightly that it was done by humans in that universe. On the other hand, in Helldivers 2 the intro video is clearly staged and prerecorded produced by the “Ministry of Truth” with the statement “scenes like these are happening all over the galaxy” making it clear that it was a staged video.
The bugs in Starship Troopers even tried to send another one which was stopped:
"Later, at a certain point, the Arachnids launched a second meteor towards Earth. Fortunately for the Federation, it was destroyed by a Missile defence turret on Luna Base. The meteor would have slammed into southern Africa, possibly at Cape Town. "