I would agree partially with this statement. When you clay you are cleaning the paint and stripping protection. You are also micro marring the paint with a traditional clay bar method. That said, you may and should only need to clay once if you keep your paint in decent shape. You also may want to consider a paint correction after clay to take care of the imperfections and the micro marring that will occur during the process. In my opinion, claying 2-3 times a year seems unnecessary.