Sure, but if you look closer you will see that all of the cells have holes for stuff to go in and out, and the proteins sticking up from the surface have shapes, and so on. That's why I said "the atomic scale" not "the microscopic scale."
Any claim about surface area that relies on the examination at the atomic scale is no longer due to the fractal nature of the lung's branches. Such claims would be equality true (or false) of non-fractal organs.
