I just confirmed this with an immigration advisor, he told me this way: Alberta gives you priority, if you have a Alberta Job Offer(for which you require no LMIA). Even if you're working in BC or an outlander, how will alberta know you have a Job offer? they just pick candidates based on your EE profile right?
So in order to show you have a Alberta Job offer, you need to say yes you have a job offer section in EE profile and there will be further questions. The only way for Alberta to know wheather you have a Alberta job offer is this section and that particular answer NO for position LMIA is to not add those 50 points to EE. This way alberta or any other province wants to filter out candidates by job offer in respective province can do.