It's currently only possible to play the mod using the Steam version of Bannerlord.
The main reason behind this is that Steam allows for account verifications, which other platforms don't do.
In addition to that, the Xbox game pass version is very mod unfriendly, as the game files and folders have been modified for compatibility with the xbox store. Even regular simple mods require extra actions to be taken to be used with the xbox pass version. However this mod was never compatible with the xbox game pass version.