"Display tags for current post" does not show all tags

This module with a "Tags for the current post" block will only display "tags", e.g. comma separated values, not those tags selected from a multiselect.

function tagadelic_tags_lists($node) {
  if (is_array($node->tags)) {

Here we look for tags, but $node->tags doesn't seem to be set for a free tagging taxonomy. Why is it empty?

/**
 * API that returns a multidimensional array with tags given a node
 * @param $node. A node object.
 */
function tagadelic_node_get_terms($node) {
  if ($terms = taxonomy_node_get_terms($node, 'tid')) {
    $tags = array();
    $vocs = taxonomy_get_vocabularies($node->type);
    foreach ($terms as $tid => $term) {
      //if ($vocs[$term->vid]->tags) {
        $tags[$term->vid][$tid] = $term;
      //}
    }
    return $tags;
  }
}

The author has chosen to ignore any vocabs that are not explicitly tags. By taking out those lines (comments above) everything starts working.

I feel like this should be an optional constraint, or at least documented.