My first response to seeing this was to call bullshit. No one would be that brazen. This is a set up so people who live their lives on twitter can come on here and get screen shots of us lot losing our shit over an obvious hoax.
If it is a hoax, it is a good one. There are multiple photos in taken in multiple settings that look like an authentic school.
The name lines up with a teacher in that area.
Multiple accounts appear to be tweeting similar material.
Also, Canada has drunk allllll the coolaid, so if this shit was going to go down anywhere it would be there. Would the school be able to stop him without accusations of bigotry? Would they dare?
So, for now I am erring on the side of it being true.