I don’t know, if they didn’t then they should have done. I’m sure that if he’d done it while he was leader, warmly endorsed the homophobes and then dragged his feet over publicly apologising, they’d have had something to say.
In any event, your efforts to delegitimise them don’t detract from the criticism of Starmer. Unless senior Labour politicians failing to adequately distance themselves from extremist views isn’t a Bad Thing any more.