A Globe and Mail investigation reports Alberta separatist figures proposed giving the U.S. access to fresh water and oil royalties in exchange for help with independence. Another separatist leader disputes it, and the investigation also reveals a Calgary meeting with Republican operatives from Michigan.
https://laws-lois.justice.gc.ca/eng/acts/C-46/section-59.html
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.