This study isn't saying that xbox live users today are better than xbox live users 20 years ago. They may actually be worse. All they say is that xbox live users today hold more inclusive beliefs than the general public today. The community could still be more toxic than the general public, despite those beliefs. And the general public could have become worse over the last 20 years.

I think games these days don't select for anything in particular. It's a giant space that caters to every taste. That gamers are more inclusive than the general public could have any of a million reasons, but I think it's easier to look at non-gamers than try to find any commonalities among all gamers