You're right but you should cite something other than the CBC, since it will just be immediately dismissed by the biased as biased.

Alberta is very important economically. I'm from there. Ontario (I live there) and Quebec and BC are also massively important. And fanning the flames of disinformation and playing grievance politics to make Albertans feel discriminated against has become an extremely serious problem.

Wab Kinew was very eloquent on this topic yesterday.

Did you watch this video? About half way through he confirms that Alberta has the highest GDP/capita in Canada and is the largest (per capita) tax contributor. Ontario is obviously larger in absolute terms, but it has at least 4x the population.