This is the second week in 8 years in which the xbox outsold the PS5 in Japan. So this isn't overall sales - the title is somewhat misleading.
E: outsold a playstation, not the PS5
E: outsold a playstation, not the PS5
https://www.videogameschronicle.com/news/for-the-first-time-...
If you click the link about the other week this year, that's where the 8 year figure is mentioned.