All illegal speech should be hidden from public discussion.
However, it would be disconcerting if stating biological facts led to censorship on a forum that focusses on science and technology.
The definition of "hate" has been stretched a lot over the last few years, and if that restricts discussion of facts and ideas, then it is harmful.
"Stating biological facts" is code for an opinion about how society should view trans people, which is off-topic for HN.
One major problem is when people presume that their simplistic understanding of a subject is factual, and that everyone else is going off emotion. For example, some people will erroneously claim that the 2 genetic human options are "XX = woman, XY = man". Those seem to be the most likely combinations, partly because we don't collect DNA from 100% of the population and compare it to the observed anatomy, but they're clearly and documentedly not the only options.
Even without considering trans people, it's factually untrue that "XX = woman, XY = man, and those are the only possibilities." And yet, people who stopped at high school biology will argue until they're blue in the teeth that anyone with a more nuanced take is anti-science.