Tbh I think that data is incredibly misleading. Every single generation of PlayStation has outsold the Xbox of the same generation(yes even the ps3) https://en.wikipedia.org/wiki/List_of_best-selling_game_consoles.

Additionally looking at the faq for that site it appears to get its data via page views. What % of console users actually use the browser? Is bet very few. Especially when you consider the ps5 has no built in browser.