You're not wrong, but for future reference, there is a way to stop such a reboot loop; I did it just yesterday with my wife's phone. (Of course, it was a Pixel, so it might not be on every phone.) You do it by holding power and down volume until it says "Command not found", then you hold power and volume up until you get a menu. One of the items should be "Power off". Another one is "Factory reset" or something like it.

Once my wife's phone was off, I left it off for a couple of hours to let it cool. Then I booted it again, and all was well.

We're still getting her a new phone though.