Correct--sort of--
What I am seeing and what I am finding during research into this is----When most of these installations were done (10, 20 30+ years ago) the RMC and poles were bonded together, relying on the RMC as the EGC and not pulling in a ( at the time"redundant") ground/bond of the wire type--The RMC corroded and the low impedance path was consequently lost---Resulting in the dangerouos and life threatening situations we now have.
I was sure that's what you meant. I was just clarifying.
The metal conduit is an acceptable means of a ground return path, just like the EGC in the cord that the
OP has installed. If the return path was to fail in either of these instances,a driven ground rod attached
to the structure would be of no help to clear a ground fault due to to the high resistance of the earth.
That is unless the resistance between the driven ground rod and source was low enough for a high enough
current to flow and trip the breaker. Which I have yet to witness.