These days with new Lilu.kext and WhateverGreen.kext, ACPI power management is taken care of by using PluginType1 like SSDT-PLUG.aml. The old way of using SSDTPRGEN.sh seems to go away, but I’ve found for some laptops with Catalina, this one is still the best for sleep/wake, speed steps and performing just like Windows would.