While it became eventually true that the Labour Party and its supporters fell out of love with Foot, Kinnock, Blair, Brown, Miliband, and Corbyn I sense that they are already disappointed with Starmer. He has, to quote someone else, the charisma of a damp rag.
He's a decent con artist, but I don't think you have to be too clever for that. Just have no sense of shame, and know how to target the right kind of gullible 'marks'.
He does genuinely seem to be losing his mind at this point though.