The meaning of this SSDT is explained pretty easily in OpenCorePkg documentation:
/*
* AppleUsbPower compatibility table for Skylake+.
*
* Be warned that power supply values can be different
* for different systems. Depending on the configuration
* these values must match injected IOKitPersonalities
* for com.apple.driver.AppleUSBMergeNub. iPad remains
* being the most reliable device for testing USB port
* charging support.
*
* Try NOT to rename EC0, H_EC, etc. to EC.
* These devices are incompatible with macOS and may break
* at any time. AppleACPIEC kext must NOT load on desktops.
* See the disable code below.
*
* While on some laptops, this kext is essential to access EC
* region for battery status etc. Please ignore EC related
* patches under the circumstance.
*
* Reference USB: https://applelife.ru/posts/550233
* Reference EC: https://applelife.ru/posts/807985
*/
Please note that on my laptop there's a valid EC device called ECDV BUT it cannot be disabled, otherwise the laptop won't boot at all.
On this SSDT it's only defined a dummy-EC device and a USBX device without the desktop properties (kUSBSleepPowerSupply and kUSBWakePowerSupply; overall it's a laptop... you don't say uh?)
- acidanthera for the original code
- Gengik84 for teaching me why the desktop values aren't used at all on a laptop