Your right Clint . There are really two definitions for using a spinner or propeller on a fly. The one I looked at adresses mostly the river system below the zone ( not added to the line ) which I don't really understand why if its outta the zones.
The one you posted is what my chitty memory recalled as to a definition of a fly ( in the zone ) . I know they adressed it when the bead craze hit. You are allowed to tie a bead into or onto the fly but not just slide it onto your leader/ tippet .
I tied a few flies that were very effective by threading a small size 8 mm bead onto some stout line like 20# , tie a knot on the end so it don't slip off then tie in the other end onto the hook shank before building the fly. It's kind of an articulating effect.
As to using lead- weight etc, I found very little need to use much weight at all and sometimes only a bead chain eyes for salmon. I like my flies big and swinging with larger profiles fished above or in straight line of sight of the salmon. Mostly I also like to fish for them in much different water ( sight fish is a more shallow broken water )
For steelhead , if the water temps are condusive to them then a swinging streamer through the heads or tails of pools has been effictive for me. Once the grasp of winter sets in it basically has become a dead drift , low, slow and deep method. That is where the skill of the angler being able to abide within the 1/8 oz rule plays a larger part over the chuck and duck method. Some days it's impossible to fish the same place you would at 335 when its 750. The only aproach then is to use an Indi , aka bobber and work the insides of those areas as opposed to a spin guy who ( below the zone ) would just add more weight and dredge deeper.
Lots of variables and learning how to read water come into play