I think you're missing the point. You say that NAI has to do with authentication but that's why it works. According to other sources, the Sprint 6800 can log into Power Vision with two different accounts. There's the Power Vision username and password that you set that controls using data on the device. The second account is supposed to be the devices ESN and it authenticates when you use Internet Sharing to tether. By disabling multi-NAI, you disable the second account so it can only log in with your Power Vision account, making it seem as if you're not tethering.
I've read recently that may only have to do with WModem and not with Internet Sharing at all. If that's the case it's not affecting anything. However I think your point about it not helping because it doesn't technically hide the connection type is incorrect.
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