It's hard to say for sure. 'Bombardment' could be inspired by true incidents but could also be entirely made up to create an engaging narrative. You'd need to look at the source and any background information to determine its authenticity.
In fact, 'The Bombardment' isn't a true story. It's a piece of fiction that combines elements of drama, action, and maybe some common themes, but it doesn't have a basis in actual history or events.
Eli Vanto is important. He is sort of an assistant to Thrawn and learns a great deal from him. Admiral Ar'alani also plays a role as she is from Thrawn's own people, the Chiss. And there are various Imperial officers who interact with Thrawn and either support or oppose him.
Free auditory bombardment stories could be stories that are freely available and are designed to have a strong impact on the listener's ears, perhaps through intense language, vivid descriptions, or unique audio elements.
I'm not sure specifically which 'the bombardment true story' you are referring to. It could be about a military bombardment during a war, perhaps detailing the events, the people involved, and the aftermath. Without more context, it's hard to say exactly.