I'm telling you what was told to those outside of those realms to help you explain how other people could have possibly gotten this view.
I don't know what Magnus shared with those inside his own realm, especially after you flipped, but from the beginning onwards he was already speaking about GX as building an empire. You don't build an empire by having equal alliances. Sure you can 'ally' with people, as long as GX was head of that alliance.
Well GX had three times the nobles of any of its neighbors so...
Also, disregard literally everything Magnus ever said. He was a teenager and that was almost 10 years ago IG anyway. It all went out the window the second Selenia was forced to take his throne from him after he'd alienated his people to the point that it sparked a civil war.