That is the OP spin, not what they are teaching. They aren't teaching that there are six genders.
From their curriculum:
demonstrate an understanding of gender identity (e.g., male, female, two-spirited, transgendered, transsexual, intersex) and sexual orientation (e.g., heterosexual, gay, lesbian, bisexual), and identify factors that can help individuals of all identities and orientations develop a positive selfconcept [PS]
Teacher prompt: “Gender identity refers to a person’s internal sense or feeling of being male or female, which may or may not be the same thing as one’s biological sex. It is different from and does not determine a person’s sexual orientation. Sexual orientation refers to a person’s sense of affection and sexual attraction for people of the same sex, the opposite sex, or both sexes. Gender identity and sexual orientation
are connected to the way we see ourselves and to our interactions with others.
Understanding and accepting our gender identity and our sexual orientation can
have a strong impact – positive or negative – on the development of our self-concept.
A person’s self-concept can develop positively if the person understands and accepts
his or her gender identity and sexual orientation and is accepted by family and community. It is harder to develop a positive self-concept, however, if the way a person feels
or identifies does not meet perceived or real societal norms and expectations or is not
what they want, or if they do not feel supported by their family, friends, school, or
community. A person’s self-concept can be harmed if a person is questioning his or
her gender identity or sexual orientation and does not have support in dealing with
his or her uncertainties. What kind of support do people need to help them understand and accept their gender identity and sexual orientation?”
The Ontario Curriculum
Grades 1-8