WINE is not an emulator, just read it's name at https://www.winehq.org/about/
WINE basically loads DLLs written to be Linux/UNIX compatible which implements the same APIs as windows. This is why WINE isn't perfect as some of the DLLs don't have all of the APIs written. If WINE was an emulator, you'd have DLLs written for windows which is being translated in real time for the processor.
The reason WINE for Android must be on an X86 Android device is because it cannot emulate X86 as it's not an emulator. It could probably run ARM based windows applications, but nothing you want exists for ARM.