The 'look at' argument's validity is based upon exactly who you are looking at - obviously. I'm not a strong believer in it either - however this is one of the few examples which I say would have weight to it. It shows that tables can be made accessible - and thus the accessibility argument falls apart. Its just a matter of good - though unsemantical - programming.
Perhaps. I am fairly new to the whole accessibility standards stuff as I never built a website which would need to be accessed by a disabled individual - and so I never looked into it. Although it is clear by its use in gov sites and site reader sites that they can be made accessible if properly coded.
I intend to do some more reading on the subject of tables and accessibility and so if you have any good resources please post 'em!