He wasn't making an argument, you said:

I'll also be curious to hear how tethering will [finally] work on the iPhone. Will it be traditional tethering or will they also have hotspot sharing?

He responded by saying that tethering already worked on the iPhone and that if you wanted to find out how it already worked you could read up on it. He also explained that it only works over USB and Bluetooth, but not via wifi.
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Remind me to change my signature to something more interesting someday