PA42,
I am fairly sure that CF means that he does not put the twist grip into the detent position until late on in the EOL. I certainly do/did the same, as it allows recovery to a hover recovery until very late, if all the ducks were not lined up.
Unless the twist grip is turned and held into the detent, lifting the lever would activate the mechanical correlator. This would open the closed throttle valve in the carb and the engine would speed up and the needles "join".