Trump wouldn't listen to his attorney is his trials, but made them go in front of judge and jury and repeat the same nonsense he was spewing in front of the cameras.
The same thing happened with his speech at the convention. His handlers convinced him to say some things that they thought might attract the undecided voters. Those part are noticeable in the first 20 minutes and the last 20 minutes of his speech. The other 53 minutes were just rehashes of his rally and social media statement. The same old grievances: the election was stolen, I didn't even know Stormy Daniels, E Jean Carrol I never met before, Biden has weaponized the government against me, etcetera, etcetera, ad infinitum. He is trying to shore up his base when he needs to broaden the tent. He is still in primary mode rather than general election mode.
He has not changed. He is totally incapable of self-reflection or introspection. He still wants to control the narrative despite advice to the contrary.