I'm a regular reader of AeroRoutes and anytime there has been a recent posting about changes to a TB route, it has always been a reduction, reversal of a planned increased or a cancellation of a route. Examples:

Delta NS25 Minneapolis – Montreal Service Changes
WestJet Removes 2 US Routes in NS25
United NS25 Canada Service Changes – 23MAR25
Air Canada Cancels Vancouver – Washington Dulles in NS25
Porter Airlines NS25 US Service Changes – 23MAR25
WestJet April 2025 US Service Reductions

So yes, I definitely think that there is actual data to suggest that there are fewer passengers from Canada to the States or projected to be fewer passengers. I'd say something, but I don't want to be banished to OMNI/PR.