Consider the following scenario. Let's say Sophie was born female and never needed to transition. Now, let's say that she got married after Acorn folded in the late '90s, and took her husband's name. In that case, we'd refer to her by the name she uses now, not the name she used then. The same goes in this case.
[1] https://en.wikipedia.org/wiki/Lynn_Conway
[2] http://ai.eecs.umich.edu/people/conway/conway.html
[2] https://en.wikipedia.org/wiki/Mead_%26_Conway_revolution
It also seems to be more likely (than in other fields) to find trans woman in IT, but I worry that this is simply confirmation bias at work? I wonder if there is any research on the relative statistics of trans folk in the IT industry?
EDIT: Thinking about it, perhaps it is just that, as with the GP comment, people are more likely to bring the fact up in a field like IT, where 'facts' are held as more important, and in other areas it would simply be ignored or not mentioned?
How else are we going to keep track of one person's name changes over the years? It's just common sense, really.