So there's a shared experience there of being a gender minority within software, but also the difference that some of our concerns are very different than women's concerns.
And software rules our world. My company lets me declare my pronouns on the internal org chart tool (yay!) but required me to select man or woman to receive health benefits (boo!). As an engineer, I can help inform system design and provide feedback on the software that gets written to handle cases like these, which makes our software better.
I expect it will take a while for insurance companies to build up risk profiles for new pronouns once those stop changing. They will want to know your biological sex and whether you are in or after transition into one of them. Depending on whatever effects social genders might have they will want to know those as well. And as a third separate item they will want to know your preferred pronouns for communication purposes.
Case in point, demographic information like gender identity is a useful feature to contextualize or find patterns in the data — like how the blog post points out that more than half of respondents wrote their first line of code before age 16, but that this statistic varies by gender and country.
If it really doesn’t matter, it will be borne out in the statistics (i.e. the gender identity feature will give you no additional information).