You’re hitting the wrong aspect of the problem. You should use someone’s old name when it’s absolutely necessary, not as a matter of course. People change their name for a reason after all, and if their latest one suffices, let it be.

In the case of this person, they were not notable under their birth name. Unfortunately, their transgender status is the whole reason they’re notable, and the article clearly states that they are. I don’t need that person’s old name to understand the situation.