Then you're wrong. We're comparing desktops to tablets here. All three have their respective desktop OS, tablet OS and phone OS. While Android and iOS chose to put a phone OS on a bigger screen and not much else. Microsoft simplified a full OS and put it on a tablet. I'll take a full experience any day.
I didn't say I agree with him; I said that's how I interpret his logic. Windows RT and WP are both Microsoft mobile OS's. I can understand how someone could think they should run the same apps.