CCK Teaser does not appear in site navigation. I've checked the Navigation menu for deactivated menu items, and don't see anything that looks like it belongs to CCK Teaser. Likewise, it does not appear on the Admin By Modules page.

Seems to me this might be a documentation issue. It's not clear to me that there should actually be an admin page, yet the main project page says there is one. If this is not a bug or a code issue, could you change category?