Originally Posted by
extreme P
The tip (in this case) is experiencing a higher wing loading due to the decrease in surface area (due to the taper).
or any number of other reasons...
A reduction in chord at the tip doesn't have to imply a higger loading at the tip. It depends on the section/camber and any washout. It's quite possible for the tip loading to be lower than the root loading. In fact swept flying wings (tail-less aircraft) are designed so that the tip loading is negative.
I think Mad Scientist had it right - the original author isn't that good.