I believe this is on a gravity feed...where the charcoal drops down a chute into a firebox. If not bumped every couple of hours the ash will definately build up as the fire can burn unattended for hours. Charcoal is a different animal than logs and does tend to ash over some.
The other post was on a log burning offset where the user appeared to be constantly knocking all the coals thru the grate. In my opinion, logs don’t really ash over all that much and simply adding a new log every 45 min will keep your fire stirred up. I never knock down my log fires in either the smoker or my fireplace as I don’t want to destroy the coals.