Ahh no, if you look at the pics further down, you can see that the buildings were covered in sections, that roads were left uncovered. Don't forget, they wouldn't have had the ability to take the detailed aerial photos we're used to now, nor would they be able to flyover very often or very low. It wouldn't have fooled anyone who had time to hover above it and study it, I imagine, but then it didn't have to :)