Since when is life drawing all about nudes? I've worked with a fair number of nude models, but plenty with clothed models, and also with chickens, dogs, even fish. All forms of life. And other forms of life such as vegetation as well as mixed. And the classes were all called life drawing classes.
Over the years I have had to use photographs and mirrors to get nude models, and there is always at least one model available. Ones self.
And I have had shows moved or canceled because there were nudes.
But all art isn't censored, all venues aren't prejudiced.
I have found a heck of lot more problems with poor taste. Yikes, the "painter of light."
Too bad about the problems facing this apparently well qualified and well intentioned art teacher. There are many, many other problems facing art teachers. At least this school system had art teachers. That's more than you will find in many schools.
Emjay