my m1 ipad pro looped power cycle with black screen spinning wheel and eventually showing screen like this

Perform a forced-restart of your iPad - as this will often clear an isolated software issue or glitch:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

If the problem fails to clear, given your rapidly approaching loss of warranty cover, you would be best advised to seek assistance directly from Apple sooner rather than later.

You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If You have access to another device, if not already installed, the App can be downloaded from the App Store:

https://apps.apple.com/gb/app/apple-support/id1130498044

You might beneficially visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad:

Genius Bar Reservation and Apple Support Options - Apple

And what advice or guidance did you receive from Apple Support when you contacted them?