In the configuration it says:
"Send email confirmation to listing owner when listing is submitted?"
So I expect that the wordpress user is going to receive an email. But the email is sent to the email in the listing. Not cool.
Especially since you may want to register some people in your directory and handle the communication with them in a different way...
I think you should either change the description text or really send the email to the wordpress user if it exists or to the listing email if you allow adding a listing without registering.