Have you ever heard a 911 call? People don't speak in complete sentences. Not everyone speaks English. They yell. They cry. They whisper. There's background noise. Sometimes they need instructions on CPR or first aid. They may not know where they are. This is a recipe for disaster.
How long is it going to take to determine that its an emergency? How many are going to mis-identify as a non-emergency. Unless its in the middle of a large emergency where its bound to be overloaded by many callers it should always be a person that classifies this.
Those questions can be asked about humans who are making the decision too. How long does it take for a human to determine that it's an emergency? How many are going to mis-identify as a non-emergency? There's nothing unique about AI here.
Did you read the article? The reason they're looking into this is because they're not able to run an excellent human 911 service, they can't hire enough people to handle the volume of non-emergency calls that are coming to the emergency line.
And what examples of ai makes you think that it will be 100% accurate because that's what is needed in this situation. Not a single one of those calls can be lost in the shuffle.