It's pretty obviously something someone shopped.
On a different note, I'm convinced all you people whining about how the Black Shroud is SO MUCH WORSE than the other areas haven't even bothered to look at it beyond the map. The reason it looks like "right angles" is only because the map is so large and repetitive, and you're looking at only the areas you can walk in from far away. From nowhere on the ground does it ever look like you're on a straight path that's taking 90-degree turns. You can rarely see very far at all through the trees and the side-to-side winding all the paths do, as well as the upper and lower levels. It's supposed to feel like a forest that's so huge and ancient that you can only walk certain places, and the tunnels and 400-foot trees do a pretty good job of conveying that if you're not staring at the map.
Furthermore, the area has just as many
interesting things to see as Thanalan or La Noscea. It also has multiple sub-environments - just like Thanalan has the canyon areas and the marshes near the coast, the Shroud has rivers and the treetop villages of the sylphs.
The problems it has are the same terrible ones both other regions have. It's too big and full of copy-and-pasted filler between the interesting landmarks, which are themselves small in number for the overall size. The plains and repeated caves and forks in La Noscea are just as bad as the ramp structures and the shaded cave-type areas (not sure what these are called, like where Little Ala Mhigo is) in Thanalan, which are just as bad as the stream crossings and identical clearings in the Black Shroud. They're all awful.