> What if trans people just don't want to work for Automattic?
That's why they're doing the survey? To find out if that's true, and if so, why it's true?
> Do we need to match the population in the first place?
If trans folks have statistically similar job abilities to non-trans folks, a disparity in hiring may indicate some other discriminatory / disparate factors that can be fixed. They might even be entirely unintentional.
That's why you do the research.