That's completely untrue. It covers all sorts of aspects about permitted uses, supporting, clearances, method of interconnect, etc....Yes it does but that article only addresses insulation over K&T not the use of or connection to or alteration.
I should point out, I wasn't disagreeing with Mark47 other than the fact that the code didn't have a K&T article. I too, like Mark have all my experience mostly in commercial structures (first for the Army, then for a major state University system). But I owned an older house that still had some K&T in it, so I do have some direct experience.
The problem with K&T is that if you can see it, you can easily inspect it to make sure it is safe. It's the stuff you can't see, which may have illegal splices, or be surrounded by later installed blown in insulation or whatever, that causes problems. Of course, if you can see it to inspect, it's also pretty easy to just replace it at that point, so it's a bit of a catch-22.