Not all. The US caught a whole 43 pounds of it coming through Canada last year out of the total 21,000 ls seized.
As for the video, manufacturing is so global that the number of companies using 100% Canadian produced materials and 100% Canadian made parts is far less than shows up on labels. That said, Canadian companies being part of the chain is better than Canadian companies not (as a guy who works for a Canadian company that needs to source materials from elsewhere).
An interesting article in the Globe yesterday. In that 43 pounds was 14 punds in Seattle that court case showed had came from Mexico.
The stat is not "From Canada". It is "Within Proximity of Northern Border".
So we are less of a risk factor to the USA.
Not that facts should ever get in the way of a Trump claim.
Just like "cant open US banks in Canada" and there a bunch of them here already.