I really wish you didn’t have to jump through hoops to read the entirety of Garcia’s paper - all I could get access to was the abstract, and of course the Breitbart writer’s opinion of it.
I played D&D as a kid back in the 1980’s, and yes the group I played it with was exclusively male and almost all white (my best friend and our Dungeon Master was Japanese). Within the game itself it was assumed female characters were about, but they were usually in the background unless they were deities or dungeon bosses (that female spider-demon queen comes immediately to mind). Fast forward a few decades, and my wife and daughter found a group they played with for a year or so that was much more diverse in both race and gender than I was familiar with (I didn’t join them because they were playing a newer edition of the game that didn’t interest me). At no point did they express concerns that the game was upholding white privilege, racism, the patriarchy, etc. It leads me to naturally ask - does the game promote a certain power structure or privilege, or does it merely reflect the standards of the players?
Long winded I know but I will always have fond memories of the game - it was a entertaining means of killing a few hours, and it taught problem solving, critical thinking, and how to work within a group. Or maybe that’s just me justifying my 14 year-old self’s existence back when girls wouldn’t give me the time of day. 
