>it's incumbent upon us to use the most currently, and thus least likely to inadvertently offend, pronoun and referents

This only follows if the value of "not saying something that would be offensive to someone who isn't even party to the conversation" (a value which we violate without a second thought, sometimes even gleefully, when it doesn't involve an anointed "social justice" issue) outweighs the value of "communicating clearly and accurately". Chelsea Manning was named Bradley Manning. She was male, at least as far as anyone else was concerned.

It's one thing to request that people call you by a certain name and pronoun now - it's quite another to insist that everyone pretend it has always been thus.