It seems really simple to me how to solve this: just teach that all sexual activity that cannot produce children is sinful in God's eyes, without ever mentioning homosexual acts specifically.

He can sign the paper and agree to never say 'homosexuality' is sinful, and then just teach the inmates that all sexual activity that isn't open to new life is sinful.
St Turibio Romo
The objective unchangeable truth has been outlawed by the NWO dictatorship.
It is perhaps only a question of intonation. Saying "homosexuality is a sin" can be prohibited. Saying "according the doctrine of the roman catholic church homosexuality is a sin" cannot be prohibited.