no it Does Not, just remove power
its not like flipping the CB or the off switch
the power off is NOT instant
you shut off the engine
the engine and generator head are still spinning, voltage and current is being produced, but it is rapidly reducing, meanwhile the A/Cs try to draw more amps to keep the compressors going, this creates a strain on the windings and the regulation circuits aka control boards
the transfer switch does not release until voltage from the generator gets below the TS threshold latching voltage
BAD NEWS all the way around
the back EMF probably took out the main control board and ignition control circuits, thats why its running so poorly