I can understand why doing it would stunt the vertical growth since she will slow for repairs, but why not just lean her over and tie her down if you’re only doing it to reduce overall height?
Stem splitting is a very high stress method for increasing THC. It’s recommended to do it just a few days before harvest because the plants become succeptable to various things with that severe a wound.
You can supercrop them to reduce height without opening the stalk to outside factors like insects and fungus.
Just something to consider…