The issue isn't his position, it's his endorsement of the CCFR which was recently mocking the École Polytechnique shooting by using POLY as a promo code for their website. Also, him claiming to have never heard of the shooting doesn't pass the smell test since he literally lived in Montreal for 15 years.
The shooting was over 3 decades ago, and Price would have been ~2-3 years old at the time.
Just how much publicity does the shooting currently get in Montreal? Are there regular commemorations/memorials of it in the city? Do the Canadiens ever have a "moment of silence for the victims" before any of their games?
Things like this do tend to fade from the public eye over time. (I mean, I could mention Denis Lortie to people and I'd probably get a blank stare from half of them.) And Price did live in a pretty isolated community for much of his younger life. Plus, being close to the U.S., we get a constant feed of American-based shootings. So I think its
possible that maybe he was unaware of the École Polytechnique shootings. (Although I stand to be corrected if someone can point to any sort of regular events in the city that he would have been aware of that highlighted the shootings.)