It's also debatable whether we are living in a simulation or we are actually brains in a jar, or maybe only you are real and I'm a conversational AI.

But it's pointless to debate things that don't and can't change what we choose to do. Notice that all three of your proposed hypothesis can't change the fact that SO isn't very welcoming and they want to change that.

Awareness of this phenomenon can change what we choose to do.

Rather than ignoring or mocking complaints from white men, we could choose to listen.

I think I get it. They could have chosen to act faster, before being forced to act by the politics of inclusivity.

I personally don't mind though. In my city many positive quality of life changes were made only after some disabled people complained. I benefit from those changes too, so I don't mind the delay as long as it eventually gets done.

I agree, if someone (SO, your city, or anyone else) finally improves their community in a way that benefits everyone, that's a good thing.

And if, as is often the case, past complaints had little effect until a particularly favored interest group spoke up, it's also an opportunity to listen more effectively to people who may have been ignored.