There was a large palisaded Indian village at the mouth of the river when Captain George Vancouver sailed into the inlet in 1793, as there were on all major rivers along the coast. Back then the natives used large rock and wooden weirs to trap and harvest their salmon from the river. What you're seeing in the video is no different from a historical re-creation.
If you live in the GVRD area, don't forget to thank the Squamish Nation every time you turn on your water tap, water your lawn or wash your truck, because the Cleveland Dam that supplies all or some of that water wiped out 95% of the spawning areas in the river and destroying the native fishery on the river. The hatchery was built to replace a portion of that lost fish but you should be thankful the band hasn't called for all recreational fishing be banned from the river until they get all of their harvest...the courts would back them up.
Not "sporting"? The very idea of sport fishing, particularly catch and release, is abhorrent to most indigenous people. They aren't recreational fishermen. They catch fish and game for food, not for sport or to play with. See what your wife thinks when you borrow the Thanksgiving turkey for a quick game of turkey basketball in the driveway. You're projecting your cultural values on a different culture...you might as well try to open a sports bar in Saudi Arabia.