Windows pushes update with no internet?

So here’s the setup. I installed windows 11 without signing in about a month ago. So no account. I did all the updates that day, installed software that once activated no longer requires internet connection. The computer is not part of any network. The few times it was connected was with a hotspot, but that was over a week ago. Since then, I have had this computer on and off several times since then with no internet. Went to use it a few days ago, again, no internet, just to use the software. Go to shut it down and it does some sort of update! Went ahead and turned it back on soon after and the update finished installing upon reboot. Checked the update history, nothing since the beginning of April. When I say no internet, there’s no wifi available, at all. Plus it’s in airplane mode. So how did it update???