Let's address a few things:

1.  This is not an argument about whether there should be a minimum wage or not (in my opinion there should be, and that is a whole separate conversation).

2.  The studies cited in justification for Ontario's proposed wage hike and changes in employment law are not directly comparable.   As stated, the combination of factors for Ontario, along with the quantum of the increase and employment law changes is without precedent and there is no published scientific literature that I'm aware of that either supports the null hypothesis or disproves it.  If you have such research, please post the links.

3.  The Card-Krueger analyses, while reasonably well-executed, are specific to their data sets which include: small increase ($.80/hr), relatively short timeframes pre/post increase, and were limited to national players in very specific industries - e.g. fast food.   No one has demonstrated that they are directly relevant to Ontario