What he said has some merit, although a pothole would probably not be a good example. Carbon fiber will delaminate when it is struck against the surface, say a bike is poorly protected on a bike rack, or is run into something. While this may not cause visible damage, the structure of the component would then be in question, I think an asterisk is a good way to phrase it. Once there is some delamination, the fork will never return to its original structural integrity the way a metal component would under the same impact.
The pothole example, however is not good, because in that case, the force would act on the fork along the fibers, in the way that they were designed to handle, and there would be negligible amounts of damage done to the fork in this case.
Regardless, Im not a big fan of certain carbon fiber components, such as handlebars, which are very likely to be struck at some time in their life, and would be very harmful in the event of a failure.