node_get_types() does not return t-ified node names

I'm seeing a very odd behavior for translated/substitued text. The function node_get_types()

http://api.drupal.org/api/HEAD/function/node_get_types

simply calls the function _node_names()

http://api.drupal.org/api/HEAD/function/_node_names

Within this function, hook_node_info is called for every module, and these should each return a t-ified node name. What wrong is that when function node_add() makes this call to generate the "Add content" page at /node/add, the node names are translated. However, if I paste the code below into a page and execute as PHP, the untranslated node names are returned. I'm perplexed by this, but can only guess it relates to the declaration of static arrays in _node_names()?

    foreach (node_get_types() as $type => $name) {
     print ("$type  - $name <br/>")