Having him call Darth Vader “Anakin” at this point in the timeline would be a bad idea all around. I think it’s important that when he tells Luke that Darth Vader killed his father, he’s also lying to himself. In his mind, Vader is all hatred and has no Anakin left in him. If he still thinks of Vader as Anakin, it makes his lie to Luke seem more manipulative.
Valid points. As long as it’s not changed to Ben calling him ‘ANI’, I’m good. 😉