This Executive Order was not a reversal of a Clinton Executive Order.
It is very common for Executive Orders to be overturned by the court. However, the discussion is about Bush not over-turning many of the ill-advised Clinton Executive Orders. There is not a single instance of the SC ruling an Executive Order unconstitutional because it reversed a prior executive order. There is a very good reason for this - it's constitutional for the President to do this!
Hell he overturned 11 on his first day and then put everything but the Antiquities Act proclamations (those only congress can repeal) on hold and they never left the congressional archives. They died on their own. You are entitled to your opinion but not your own set of facts.