Not sure what your gripe is.  Hydrcracking uses more energy than it generates as well.  Are you suggesting people shouldn't know about electrolysis because it obeys the law of conservation of energy?  Oh, and you don't burn the sea water... you burn the gas that comes off the sea water after a current has been applied.  Many of the methods of generating H2 mentioned in the article are less efficient than electrolysis or are even purely theoretical.  (engineering cyanobaccilus to make hydrogen etc.)