Nope. Not copyright law but trademark law.

It seems, you didn't even read until the end of the article:

> Therefore, the most likely answer is that the distinctive shape of 1 World Trade Center is either trademarked (although I could not find it within USPTO databases) or is so recognizable that it is easily defensible via a common law trademark and the game developers were unable to secure a license to use the trademark before their deadline.

Right! D'oh.

> You’ll see that they are acknowledging the trademark holders, NOT the copyright holders.

In the end Steven guesses its a trademark issue

So much for "Freedom" tower.

So much for "free" country...

Free as in beer, not free as in tower.