Furthermore, I remember around the beginning of the gamergate stuff, a common refrain from chuds was that if SJWs want games with more normal portrayals of women, SJWs should make their own games

Well we're currently in kind of a golden era of indie games. There have never been as many independent creators than now, and that seems to have simultaneously led to a slight increase in diversity among video game devs at big studios. Since more people are making games now.

It's a simple numbers thing too since games are far more complex now. Atari 2600 games were frequently made by a single programmer. The first Doom game had a dev team of something like 8 people. Red Dead Redemption 2 had a team of 1,600. At a certain point there will simply be more women, more gay people, more than just cis white dude bros working on your game if the complexity requires more people. And that's invariably going to lead to more diverse perspectives represented in the final product. Chuds want to ignore that and want cis white heteronormativity to be so powerful it overrides the very people designing the games.