The tariff announcement was made in Sept/2017 and finalized later that year. It would be disingenuous to suggest the tariff only existed for 30 days when the damage was done months before. While there might be some blame to lay at the feet of Quebec comparing Bombardier to AB is another fallacy. Both companies where in completely different positions at the government bailout juncture.
Bombardier suffered death by a thousand spears. The tariff only amount to a few dozen of those.