Yep had one of these on Gold River too....
Was fishing an area catch and release that was open in the regs.
3 native fellows came down and gave me and the girlfriend a super hard time for fishing there. Just kept asking if we had asked the chief to fish there every time we would talk (as we were packing up). Eventually just walked away, but it was sketchy. Middle of no where and 3 pretty aggressive guys that wouldn't even let us get a word in, and it appeared they were escalating it, even though we had already packed up and were walking away and had apologized (we simply didn't even know we were on reserve land). Started following us and I was seriously questioning our safety. They also kept telling me that DFO would arrest us if they caught us there. Checked the regs to be sure and it was indeed open. Probably won't go back even though it says it's open, just because I don't want to deal with that and risk safety in a remote area.
Not even 100% sure if these rivers are actually closed in those sections, or if it's just select FN trying to keep you off their land so they can do questionable things. I know on the island it got so bad with band members vs fisherman that DFO eventually did close sections of the river down permanently, such as on the lower Cowichan and the Lower Big Qualicum...