That's a bit of a misrepresentation of what would happen. The voter in Saskatchewan would participate into equal weight as someone in Alberta for the regional voting results. The regional voting results allocate the seats to each party on a proportional basis, and the allocation of those seats is strictly determined by the local voting results.
The votes in Alberta would have no role in those results, and the votes from Saskatchewan and Alberta would be on equal footing to determine the regional outcome, which they should be. One person with one vote mandates that be the case.