There's nothing special about AM radio from a sending information to the populace perspective. If people are only listening to AM radio during emergencies then according to your thinking those same stations would be shut down.
No, let's cut through the BS. This is about a GOP-led Congress legislating the ability for their constituents to continue being able to listen to conservative talk radio and trying to, not so cleverly, frame it as assisting people during an emergency.
It should be easy to see it doesn't add up.