Honestly, I don't think this is true. Tech people tend towards a libertarian bias in my experience, and I'm old. I've been a professional programmer for about 30 years now. I've met more libertarian tech people than progressives, by far.
[1]: https://www.cato.org/commentary/examining-libertarian-vote-d...
Also in these latter days, since 2016, the Republican party isn't particularly libertarian either. That's a factor.