hook_form_node_type_form_alter does not work
You have a syntax error on the last line, it should start with an apostrophe, and your constant is mispelled.  So it probably isn't compiling properly.  If drupal was picking up the hook you would probably get a white screen of death.

So this means:

You need to make sure the beginning of the function name is exactly the same as your module name - did you use a capital A when naming the module?  PHP is case sensitive.

Lastly, make sure you clear the cache so that Drupal picks up the new hook.  Install drush if you haven't already, go to the /install_directory/sites/mysite directory and run

drush cc all


(assuming you're on linux with command line access)