This gets a little clearer (I think) in the 2002 code. 680.4 requires compliance with parts I & IV of the article, part IV is the section that deals with hot tubs & spas.
680.42 has some additional wiring requirements for outdoor installations.
680.44 requires GFCI protection. Of course, theres the usual cast of exceptions.
Every hard wired tub I've seen has GFCI protection mandated in the instructions.
Few things are harder to put up with than the annoyance of a good example.