I’ve spent time in sntsk’il’ntən, and one of the things I’ve observed is the amount of orchard and cattle fencing in the area that blocks larger animals from using the obvious corridors. In some places, animals moving through the area would have to climb a significant way up Black Mountain just to get around the fences.
It’s better than nothing, but the corridor definitely doesn’t track the actual traditional routes the animals would choose to take.
That said, the bears still use their old routes and routinely knock over any fences that get in their way, so there is that.