I don't have any sympathy for the teacher TBH. She obviously believes what she's saying, most of which is factually untrue. She doesn't sound like she's been forced to say it, she sounds like a true believer.
As for needing guidance on how to tackle this, surely you don't need guidance to not completely lie and disparage pupils who disagree?
Let's say the government goes (even more) nuts and sends out guidance that says you need to teach something like the earth is flat, or being gay is a sin, or that there's one true religion and everyone else will go to hell, would you teach it as is or stop and question it?
Surely you need to think for yourself about whether things are appropriate and true? Why would you teach blatant lies? Which lies are acceptable and which aren't? What makes this subject the one that it's okay to lie about?
Why do people that believe in gender have so much power over people that they can stop them speaking the truth?