Really? I just thought it was a normal desert. Also, I don't remember anyone saying a meteor fell there. In fact, the town map just has it described as road-construction thats been stalled due to a sandstorm.
And nowhere around it has anything related to a meteor. The route and green dot to the left are the Desert Resort(where trainers gather) and Relic Castle. None of them have anything to do with meteors.
Also, the pokemon they mention, is nowhere near there. It is in a place called "Giant Chasm", which is all the way in the upper part of the map, right to the right of the Pokemon League.
So yeah, unless I completely missed something, the only reference to 9/11 is the height of the pokemon, which is completely coincidental.
EDIT: Actually, let me just copy/paste the description of the route from Bulbapedia, the same place they linked to in that section of the article.
Bulbapedia said:
Route 4 starts off with a paved road from Castelia City which ends abruptly another fifty steps. Along the paved road are abandoned construction sites. To the west of the paved road by Castelia City's exit, there is a large cliff with the sea at the bottom. To the north of the cliff-lined sea, there is an another abandoned construction site, which looks like a planned community project that got scrapped due to the harsh and arid environment. In the middle of the route, there are two paved routes; one that goes north towards Nimbasa City and the other facing west and eventually north, towards Desert Resort. By this corrupted intersection, there is an overhead highway going east and west. Trucks can be seen passing through the highway.
Source so you can see for yourself [http://bulbapedia.bulbagarden.net/wiki/Unova_Route_4]
Nowhere does it mention anything relating to any meteor.