When I finished reading it I thought it was an anti-Trump piece, but the author also wrote: "That's why it baffles me that some prominent technologists embrace hateful ideologies.". Was Trump a techie too? He must have been behind the creation of JS.
"The ARM processor which powers the modern world was co-designed by a trans woman." This is not factually correct. Roger Wilson was one of the designers of the processor, but he didn't transition to become Sophie Wilson until 9 years after the first release of ARM1 according to Wikipedia.
Yes, the understanding is that trans people were always trans. It may have taken time for them to understand that and perhaps more to decide to adopt that identity publicly, but they're not "not trans" before that. Other queer identities are generally thought of the same way in queer communities: many people have early experiences (e.g. fixating on same-sex characters in fiction the way peers might opposite-sex characters) that they later realise were early expressions of their orientation.
The transgenderist stance is that once a man announces he is a woman, then he was always a woman and always will be. Unless he detransitions of course. Then he was always a man and always will be. Same for when a woman declares that she is a man.
So a man who builds his entire career as a man, with all the privilege that brings, as Wilson did, can identify as a woman and these prior achievements now all become that of a woman. Even if this stretches plausibility, what with the sexism of the industry at the time. He can even receive accolades reserved for women, as if he had to work ten times as hard to be taken seriously in a male-dominated field.
This rewriting of history is also why, for example, film credits listing Ellen Page have been retrospectively updated to Elliot Page even though there was no Elliot Page at the time of filming.
"The ARM processor which powers the modern world was co-designed by a trans woman." This is not factually correct. Roger Wilson was one of the designers of the processor, but he didn't transition to become Sophie Wilson until 9 years after the first release of ARM1 according to Wikipedia.