I think that is correct. Most Gulf refineries were designed to refine high sulphur (sour) crude from the Gulf. Canada has traditionally been set up for refining low sulphur (sweet) crude found in their oil fields. I think its easier to go from sour to sweet than vice versa. At this point I think most refineries are pretty well set up to handle whatever type of crude comes their way.
Regardless of oil type, refineries are constantly changing the mix of the products they produce based on market conditions and other business plans. If gasoline prices tank, they will produce less gasoline and increase production of other refined products (chemicals, etc.)
I think the current gas crunch (across the globe) is an aftershock from shuttered production during covid that isn't yet ramped up again to meet growing demand for fuel.