It's not made clear in the article, but they're talking about native subsistence hunters. To these hunters, hunting is not a sport. It's about getting your regular supply of meat to feed your family in as efficient a manner as possible, using the tools you have at your disposal. Head out, get the meat, and get back as quickly as possible. It's cold out there.
Having spent a lot of time in the NWT, I can tell you that many people use rifles that are old, decrepit and in many cases outright dangerous. These have been handed down from father to son and are tools, like a hammer and saw, and not works of art. Many have either very poor optics or no optics at all. The hunter will do what he (and it's almost always a he) has to do to get as close to the animal as he needs to in order for whatever rifle/optics and caliber combination to work. If that means chasing an animal on a skidoo until he's 20 yards from it, so be it.
You might also note that populations densities are very low in the NWT. Unless you are prepared to go to two decimal places, the population density is 0. In an area of 442,000 square miles, the population is around 45,000 people, so the actual population density is around 0.04 persons per square km (sorry for mixing up units, but you get the picture). There are a small number of "towns" which together have the majority of that population (Yellowknife, the capital has about 18,000 people and the next largest town is Inuvik with about 3,500), so unless you live in one of those towns (and a larger one at that) anything firearm related can be very hard to come by and very expensive.
I'm not defending these practices, only pointing out that "fair chase" is something applicable to sport hunting, not feeding one's family. Having said that, the laws are in place for a reason, and it's good to see that they're being enforced.