That is a good diagram. If you pinch too early, yes you lose the main cola. If you pinch after the plant is well into bloom you stimulate more growth. Autos like a pinch when well into bloom. Photos like it before they bloom. Since
@Autoimmune has a tall pheno, the pinch would stop it in its tracks. Then the buds that are already developed, will speed up drastically. The cola is already at the right height. It will get a fatter main cola, and those arms will get to catch up. One little pinch will do all that.