Galaxy Tab S5e. Thank you.
Solved. changing one entry in build.prop as described in https://forum.xda-developers.com/s7-edge/how-to/guide-how-to-s-health-devices-knox-t3543306 to get samsung health to work also solved this little issue.
Flash original samsung image with odin, reboot: phone works
Flash TWRP 3.1.1 with odin, reboot into recovery, install dm-verity 6.0, reboot: phone works.
Reboot into TWRP, install Magisk 15.0, reboot, PHONE WORKS.
Yay is me.
My nexus 10 scored 160 in the same test, so now I know what to expect.
Awesome, that is exactly what I was looking for... Do which processor is the better choice, exynos or snapdragon?