A small but simple change would be this:
This approach, although a step in the good direction, has its problems: what if someone’s gender identity is more fluid? Identities change, and someone’s identity five years ago can be different from their identity today. Nevertheless, if someone wants to be addressed properly, their pronouns have to be made known.
In conclusion, APA’s suggestion of using the singular “they” when someone’s pronouns are unknown to you is probably the most viable approach. I don’t expect publishers and journals to change their article layouts just for the sake of inclusivity. Nevertheless, it is a worthy change to argue for and one I hope will be implemented in some form in the upcoming years.