For my classes I do. Do you have the Errata and is your NEC Updated? Without the errata your code book is not current - depending on what edition you have,
I would not place all the blame on the CE instructors. You have the responsibilty to go to the NFPA and get the updates. They have a subscription alert sevice you can subscribe to. Maybe your CE instructor doesn't know about the TIA and erratas.
I don't think he was blaming the instructors, but rather pointing out that it would be nice for them to sometimes cover some of the basics of how the NEC works. I had been using it for several years myself before ever hearing of TIA's, or errata, both being introduced to me at CEU classes. If I did learn about them in college, it did not stick in memory, but that is the type of thing most of us would not remember that early in our career and is easier to pick up and remember later when it means more to you and you see good examples of why it happens.
For those that don't know the errata is an editorial listing of corrections of errors found in the printing. Not a change of content just corrections of publishing errors. It may contain simple misspellings in some locations to complete missing sentence or even complete missing section that was supposed to be there. If you purchased an early release you may have a copy with more of these errors in it, as when later editions are printed they correct any known mistakes before printing. Somewhere in the front matter of your book it tells you what revision you have, and the errata data tells you what revisions it applies to.
When I first learned about this was probably about the time we were using 2002, maybe 2005 code, and we did by looking at errata information that we had people in the same room with different revisions. Some had early revisions with mistakes, and others had later revisions without those mistakes.
Just to be clear, a self contained hot tub or spa that has a factory cord and plug is not covered by the NEC.
The NEC does cover the receptacle and everything upstream - as has been mentioned. The hot tub may have some additional requirements in instructions though that are a part of the listing of the unit.