The docuмent is morally repulsive, not only to Catholics, but to the two Jєωs and one Muslim I showed it to. The twisting of Scripture to make Gal. 3 support the pervert agenda is blasphemous. The parents should pull their children out and the school should close at once. Sell the property and give the money to parents towards homeschooling. It is the depth of hypocrisy to call a school "Catholic," which defames Our Lord and corrupts children. (Anyone look good in a mill stone necklace?)
If the civil arm prevents having a school that upholds morality (natural law), then do not have a school. Parents who cannot homeschool can have their children taught for free in public school. At least in public school, there is no hypocrisy; it is openly corrupt without pretense of being anything other than a moral sewer. To possess foreknowledge is to enter battle well armed.
If neither homeschool nor actively waging warfare against Satan in public school is acceptable, then move out of Canada, or to a remote place in the Yukon and "unschool" the children. (Yes, there is such a thing as unschooling!)