What is the cause of the increased sales in Japan? Are those that never owned the system buying it to play all past games they missed on gamepass, or are they buying it for the future games that will be coming to the system? I don't read all of the weekly famitsu sales charts has there ever been an Xbox X game on the top 30 sold list of any given week? Even Playstatoin 5 games rarely crack into the top 30 list for more than a few weeks before Switch games from 4 years ago passes them by on the weekly charts.
Only very few XBS games have had physical releases in Japan so far and all were in limited quantity, never enough to enter the top 30. It's basically almost only digital and gamepass.