There's plenty I'd agree with him on in politics, but he's one of a small number of actors, comedians, media figures on the right of the British labour party who not only dislike the left of the party (the FAR left or HARD left as they usually refer to them) but have actively attempted to disown, lie about, expel and otherwise deny them any say in a party that historically grew from the left. It's a long and painful story, and not one I'll bore you with. Suffice it to say that within certain sectors of the party, including probably a majority of the staff and MPs (which is one reason Corbyn had such a nightmare keeping the organisation running) the left are good for delivering leaflets, doing the shitty door-to-door stuff at elections, and paying subscriptions. If they want more they can just fuck off.
Edit: also, that's a Guardian interview. They're hardly going to give him a hard time in an interview, having worked hard as dedicated fellow anti-Corbynists while he led the party.
EDITED: 11 Apr 2023 18:00 by WILLIAMA