Boot Loop | but Bootcamp Windows still works |

suddenly my passcode was rejected. MacBook went recognizably slow and and I forced a restart. No change. After one more restart the boot shut down. Since now I’m in an ongoing boot loop. The Mac shuts down immediately after 3seconds. With NVRAM reset keys I can force the Mac to shut down only after 10-15 seconds but still no boot. The only start options working are option bootcamp and Target mode. I already tried booting with removed battery cable (inside) and to boot from usb stick. Still shutting down and automatically restarts. BUT I can start and boot my windows with bootcamp!

my feeling is, that pressing power button to force shutdown, scram and nvram restet do not work properly but have influence on how long the Mac at least behave after that. So while trying over and over to get these keys pressed at boot start the Mac once starting showing the apple logo or a rotating circle again or only showing dark grey screens before shut down. What I not had a single time is the typical progress bar after a shutdown?

And how do Itechnically can erase my MacBook if I can’t access restore mode. Would it be a idea to delete the Mac volumes (maybe efi) in windows bootcamp?