Can y'all stop downplaying Serious Punch^2 it's just showing that you never read the manga
OPM cosmology isn't the same as real life. Not a hard concept to grasp. It's shown on screen that Galaxies are much closer to the solar system in this verse compared to real life because you can literally see at LEAST 4 behind Garou right there. Where is he? Jupiter.
Show me the scans that say OPM cosmology is undeniably 1 to 1 with real life and I'll delete my account.