How would I know that? I don't read documentation until absolutely necessary. If it claims to find faces, well, then let's see it work! And then we'll count the faces found.
In any case, the documentation is wrong if it says that. E.g., the software found all seven SEGs in the photo below:
http://www.bagnewsnotes.com/files/2011/10/Romney-Bain-Capita...