As usual, snopes comes to try to mislead. (Not that the purple penguins is completely honest either.
It's not a "ban" per se.
It talks about gender identity, and that they should split the class, rather than by gender, but by things like preference. To minimize using gender terms like "you guys".
Further, they want to teach kids (not sure at what age that starts), that there's your biological sex, the sex that you associate yourself as, and the sex you want to be addressed as (male, female, both or neither).
At one point it does bring out the purple penguins as one of many alternative "gender inclusive" terms.
Personally, I think this goes from the ridiculous to the harmful, depending on just how strongly this gets enforced in schools.
It's bad enough that most kids sports don't even count score in the games... now they want to just further and needlessly confuse children.
Since being LGBT is really a small portion of the population, and that this seems to be aimed at younger children, who would never have even thought about being LGBT, or as a spectrum of gender, at most just the biological aspects of sex education should be made, at an appropriate age.
Or maybe taught as part of inevitable "sensitivity training", but to transform the sexual identity of otherwise normal children is wrong.