So you're saying the Xbox One X plays Xbox One games similar to how Xbox One plays Xbox 360 and OG Xbox games? I have seen nothing remotely suggesting this. Yet alone anything suggesting the Xbox Series X will be playing Xbox One games like the Xbox One plays Xbox 360 and OG Xbox games. There has been no REASON given for me to believe this yet alone The Heutchy method being applied to the EMULATOR of Xbox 360 and OG Xbox games on Xbox One can somehow be applied to Xbox Series X playing Xbox One games. I would love to be wrong but I have yet to read or see anything saying otherwise.
Lord knows I would love Xbox One games to be enhanced on Xbox Series X. LOL
360 games access the Xbox One Hardare via an emulation layer.
Xbox One games work in the same way via virtulisation.
Neither type of game directly accesses hardware, rather they speak to one of the 3 OS's the machine has and that accesses hardware on their behalf (this is how the Xbox one X can run Xbox One games, despite having an entirely different memory architecture)
For the sake of ease you can think of these as the same thing.
The Heutchy method increases the resolution by having the OS which talks to the GPU ignore the request from the game for the specific resolution and instead uses one 3x that request.
I have 0 doubt could be applied to Xbox One games on XSX with the same testing procedure they went through with 360 games.