Another way to imagine an emulator - think of a thin layer of software that read Python byecode, and then dynamically translated it to Ruby bytecode on the fly.
This would be neither a Python implementation nor a Python VM - but it would be a Python emulator for the Ruby VM.
But if someone wrote their own Python interpreter, like PyPy, this is a new Python VM implementation.
Scumm as far as I'm aware never existed on ARM, ( or Risc V for the sake of argument), so ScummVM on those platforms are in a sense Python on Ruby.
This is of course hugely muddy. Nim for example can target C and Javascript, neither is an emulator, I'm not sure a 3rd target by a separate developer would be either?
But is Scumm on ARM just a thin layer converting Scumm "bytecode" to ARM machine code? Of course not, it is a full game engine just like on x86.
A true Scumm emulator would translate Scumm script to another game engine like SGI (Sierras game engine), but of course due to the extremely high level nature of these game scripting engines finding direct translations would be near impossible.
This would be neither a Python implementation nor a Python VM - but it would be a Python emulator for the Ruby VM.
But if someone wrote their own Python interpreter, like PyPy, this is a new Python VM implementation.