I agree with most of his points, but two of them seem a little off to me.

STOP underlining text that isn’t a LINK - There are a lot of places where underlining makes sense. If you've got the links in a different color, then it shouldn't be an issue; besides, after one click users will figure it out (please don't tell me this isn't true or I'll lose all faith in humanity).

I still really hate dynamic dropdown menus. A lot. - Sometimes they make sense. They probably shouldn't be part of your main navigation, but they work well for things like country and state/province selectors. Remember to have it degrade gracefully, though.