How come freedumb activists squeal about Charter violations when they incorrectly think the government is overriding it, but don't care about governments actually circumventing the Charter when it hurts labour?
Governments overrided the Charter about a gazillion times during COVID. Typically the correct call during the lockdowns. Use of Emergency Act is debatable. Notwithstanding clause against the union to keep kids in school after missing a ton of time in the classroom is also debatable.
Even if using the clause is wrong, using the education of children as leverage to get a raise is reprehensible, that strike is going to be a tough sell to the public. But i'll give it to educators, they have fantastically tough unions.