Then he might as well harvest it a week early too because he is taking away the plants ability to take in light and convert it into making buds grow. Before I chop the plant on harvest day I will pull all the fan leaves off by hand, I find it makes it easier to trim.
Not necessarily. The buds still have leaves on them that can process light and the trichomes continue to mature under the light. The OP said "fan leaves". Might lose some potential growth or yield but would be very little. Plants have already done most of their growing by then anyway. But the guy it taking away energy that the plant would be using during the flushing process IMO.
To each their own...if he feels the pro's out weigh the con's then thats on him. He may do it a week before to allow the wounds to heal so moisture does not leak out of the cuts and create a faster dry. (im just trying to be in dudes mind, lol) Its not the best method imo but I wouldnt go as far as saying he might as well be harvesting a week before thats a little exaggeration.
I wouldnt recommend it because I like to do what zubey91 does. I have been preaching this method over and over. The dry is even slower and more even if you chop the plant at the base or pull it as a whole w/ the roots. I really need to do a write up on this method.