I gave up on that and downloaded Health from Samsumg Store, then ran Magisk Hide on Health App and it worked?!!. The SpO2 and Heart Rate sensors work as well as Samsung Watch Sync of data.
Only left to work out the Secure Folder thing and then 100% working.
I lie...
Had to edit buld.prop and set some value from 1 to 0 and then it worked. Very likely the value is to check on root existance but after setting it to 0 it worked with SpO2 and HeartRate monitor just like before root
Ro.config.tima=0 on build.prop