"Immediate Release" never heard of that one. I have about 30 corporate lawyers I could ask for an interpreation of this, but none of them are fly fisherman or fishery litgators as far as I know.
The Umpqua regs I believe are going after the lead core lines some fellows use out west in their fast deep narrow white water and pools. Normal sink tip and sinking fly lines I believe are acceptable.
Fred Evans who lives near the Umpqua on the Rogue can advise on this. He is our resident SW Oregon steelhead spey fly fishing subject matter expert.