I did that prior to pulling the plug and the engine still wouldn't start. I learned that it is best with my ZDZ to not shut down the engine with the choke because it is easier to start on the next flight. I believe that the thread topic is about using the choke to shut down the engine.
Just trying to help out. Forgive me.
FWIW... I found my ZDZ-80 to be rather erratic when it came to start characteristics... one day great, the next very hard to start, with nothing changing in between days. If it got flooded on one of the endless flipping day then the quoted technique worked very well. I'm much happier with my new motor... never had an issue starting.
I normally kill my engines with throttle, but I have a choke as an emergency back-up... I do not use it on a regular basis other than for engine starting.