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4:1 is the US average for software engineers.[1]

[1] https://www.bls.gov/cps/cpsaat11.htm

That's less skewed than I had expected!

Autism spectrum disorders are also massively underdiagnosed in women, in part because the way many girls are socialised requires them to behave in ways that can mask the social symptoms.

Came here to say this too. Same for ADHD.

4:1 is about the ratio of male to female developers anyway so they shouldn’t be doing too bad.

If you take a group that's 4:1 on average, and then apply a subgroup filter which is also typically 4:1, that doesn't imply it comes out at 4:1 on the whole. Correct me if I'm wrong. It seems very likely that their ratio is far worse than that.

You're right, the ratio will be closer to 16:1 after selecting out people with autism from the 4:1 group.