Personally I don't see the point of this type of weird plant bondage.
Far better to just let the leaves do their job of making the energy that your plant needs to grow it fastest.
Any reduction in leaf surface area/coverage just reduces your plants ability to produce energy, thereby slowing growth.
The cannabis plant has evolved to be at the peak of efficiency and applying questionable "bro science" in an attempt to improve on nature and thousands of years of evolution is man imposing his ego on plants just because man thinks he knows better!
Also, any upside down leaves can not make any energy, light needs to strike the upper leaf surface to be able to go through the process of photosynthesis and turn into energy that powers your plants growth.
When it comes to defoliation, just remember -
Less leaves = less energy being made = less growth.
It really is that simple!
Hope this helps, Organoman.