I dont know what idea you have of Canada, but he wont go 8000 km across the country off road...and we have alsphalt here...
He asked about where to get a tyre in N BC or the Yukon, not what tyre to to cross the nation on. I'd take the e-07's, I explore a lot of gravel & I don't press my luck on the Tarmac.
OTH, you are right, if he never veers from the Alcan and takes I-5 and the pan am south, the Mitas tyres are not a good choice
My idea of Canada is limited to the interior BC, W Alberta the Southern Yukon, SW BC (n to whislter) & Vacouver Island.
It has awesome whitewater & skiing, old growth forest, high alpine glacier, rain forest and endless stands of fir. It has countless miles of dirt road to be explored and many very nice paved highways. Much like the USA.
The e-07's are what I'd shoe up in N BC were it me, but he could obviously roll on Anakees or whatever.