Is there any way to remove the sound alert message?

As confirmed by OP the solution that worked is posted below

You can try automation. I prefer Macrodroid, being easy to learn and free (upto 5 macros)

Create a macro

Trigger: Notification → Notification received → Select Application → Google Play Music → Text content contains → prolonged listening with a loud sound can damage the ear

Actions:

1. Clear Notifications → Clear all




2. Optional if you don't want notification sound ; Volume Change → Set notification on slider scale to zero

Constraints​ : Leave blank