Typical disclaimer, etc etc.
You nuke your phone, I'm not paying for it
Thanks to @zefie for converting the kdz to a zip.
The anti-root removal
I flashed the zip in TWRP, rebooted to the OS, and was unrooted.
Reboot into the bootloader, and flashed TWRP.
Rebooted into recovery, flashed the lucye anti root removal, then rebooted into recovery again, and flashed Magisk.
Phone has been fine since Thursday.
Additional MEGA mirrors: