>And during most of that time

Most of what time? The patent just expired a few months ago. Generics are now ramping up because the patent expired, not because of some hypothetical eight year clinical trials. And for that matter, generics of existing ingredients and dosages do not have to repeat clinical trials anyways, which is one of the big reasons generics are a lot less expensive.

This hypothesis seems retconned and completely at odds with the actual facts. Not least that there has been absolutely nothing exceptional about the pricing of their product in Canada, which has always been one of the cheaper pricings worldwide.