[kostaman]

CoreElec is dead and has been abondoned.

I'ts not Dead or Abandoned. 
It's a fork of LibreELEC supporting Amlogic Socs which LibreELEC Abandoned any official support for. 
Devs from LibreELEC were banned from developing community builds for Amlogic soc devices so CoreELEC WAS BORN.

When I get a chance I will move my power off menu to code as used by Estuary, but not sure if that will help if you are still using CoreElec.

I'll test and if it doesn't work I'll get support from CoreELEC Devs to see what can happen.