So sedition boils down to:

Actions and speech in support of the use of force as a means of accomplishing a governmental change within Canada.

The relevant law on treason I think boils down to:

Communicating military or scientific information or any sketch, plan, model, article, note or document of a military or scientific character that may be used by another state for a purpose prejudicial to the safety or defence of Canada.

Economic data is scientific in nature, Alberta separation is prejudicial to the safety and defence of Canada. I think there's a case for treason charges.