Several impressive videos on social media have shown that programming without using vision or even hands is perfectly possible, there are very few good reasons why such underrepresentation shouldn't be corrected for. In fact, I believe for many disabilities a job in fields like data science or programming would be much easier to adjust for disabilities than many other sectors where interactivity is key.
Do you have any data on that? It does not coincide with my anecdotal experience. I'm in a Math/CompSci department and there's zero trans people here (that I know of), while there are some in other departments. Anyhow, trans people are a tiny percentage of the total population, so it would be hard to have somewhat solid statistics on them.
There was a smattering in other afaik. I was on the board of the LGBT club so I knew at least the ones who were out / came frequently.
The same can't be said for people who are blind or deaf.