[buisi]

Using "she" and "he" would be hurtful in reference to a non-binary individual. Non-binary are more common than you think.

"they" is useful when you don't know someone's pronouns, and it's better to form a habit of using "they" for everyone (not just non-trans imo), than to accidentally use the wrong gendered pronoun, which may trigger their dysphoria more strongly.

I'm not getting the notion from this policy that it is intended to get individuals to deliberately use the wrong pronoun, because they're uncomfortable with using the correct pronoun for them. But, if you think it is ambiguous, then it could certainly be reworded.