No, it wasn't. This is what I was replying to:
The teacher isn't saying they are trans, wanting to be non binary does not mean you are trans.
Stonewall, which has advised a great many government bodies, police forces, councils, universities, major companies and other charities, says in its glossary, thus presumably reflecting what it says in its advice and training sessions:
Trans
An umbrella term to describe people whose gender is not the same as, or does not sit comfortably with, the sex they were assigned at birth. Trans people may describe themselves using one or more of a wide variety of terms, including (but not limited to) transgender, transsexual, gender-queer (GQ), gender-fluid, non-binary, gender-variant, crossdresser, genderless, agender, nongender, third gender, bi-gender, trans man, trans woman, trans masculine, trans feminine and neutrois.
https://www.stonewall.org.uk/list-lgbtq-terms