What does the enable/disable ME subsystem option in Supermicro X9DRi-F motherboard BIOS do?

It’s well known fact that the Intel Management Engine can not be completely disabled. Its functionality can be greatly reduced using me_cleaner which utilizes various techniques including switching the ME “kill switch”. However, the Supermicro X9DRi-F BIOS contains ENABLE/DISABLE option for ME subsystem: Motherboard manual says the following: ME Subsystem Select Enabled to support Intel…