I can see the reasoning, even if it's not pulled off very well. They obviously want something to be playing to reassure the caller that he or she is still connected to 911 while the call is transferred. The choice of the "commercial," rather than, say music, is inexplicable, however.
I want to know I have reached the right place... A repeating recorded statement such as "You are connected to 911 emergency services. We will be talking with you momentarily. Please have your location and other vital information available."
An advertisement of ANYKIND is not what I want to listen to when I am trying to save someone's life.