don't be silly, you just claimed that it doesn't matter whether you have 3 meter blades or 30 meter ones. Of course the swept area matters.
P = 1/2 x ρ x A x v3 where ρ = air density, A = swept area and v = velocity of the wind
P = 1/2 x ρ x A x v3 where ρ = air density, A = swept area and v = velocity of the wind
These wind towers on the other hand capture and manipulate the whole air flow from the area of their intake, not just the part directly interacting with the blades of a traditional turbine. That's why it is physically possible to extract much more power than with a traditional turbine with an equivalent "swept area".
You are right about the second part, those 'tunnels' do catch all the wind of their area.