They might want to be somewhat careful here so as to not piss off the provincial government. As a foreign, anglophone company, I’m sure there’s a rule or inspection they can produce if they need to to make Amazon’s life miserable. And they won’t care if Amazon leaves.
I don't think the government will get involved at all. Seems they had these specific labor laws for decades. It'll just go to court and get settled there.
I doubt Amazon are the first to try skirting these.