Gmack said:
Let one AHJ stand up here and say it is NEC 2005.
Gmack, I don't know what to say to bring you around.
So far, three inspectors on this thread alone have stated either directly (Bryan Holland, post #44, and Pierre Belarge, post #35) or indirectly (rcarroll, post #2) that an equipotential bonding grid is required on hot tubs. Mike Holt believes so as well, by the article that you posted. Don has been in the trade over 30 years, Bob for over 20, Trevor for over 20, and they all agree that 680.42 requires an equipotential bonding grid be installed according to 680.26's specifications.
I understand it may be extremely difficult to overcome the idea that somehow you've passed hundreds without one; but that doesn't make it legal. That doesn't make you a bad electrician - I hear about something else at least once a month from hanging out here that I was trained to do that was either illegal or just plain dumb. I learn and move on.
You seem hung up on hot tubs being permanent or temporary. I have this to say about it. The code is silent on it, a hot tub is a hot tub. If you have evidence to the contrary, produce it.
The other thing I have to say about the "temporary" hot tub, is how many people do you know of that have hot tubs they move around the yard? Realistically, I know of noone who drains their tub or leaves wheels on it, that they can soak in the front yard if they feel like it. Generally, a hot tub does not have to be anchored to the concrete to be there permanently. Just add water.
I share Pierre's frustration. If you cannot reason, we cannot discuss. You have to give us something to work with to maintain a discussion.