"So perhaps he has changed his mind about Corbyn"

Nope. He still thinks he is an 'antisemitic' and - surprise - an extremist. The garden variety, standard European left-wing politician is an 'extremist' in his view. And according to him, Starmer was what the UK needed. So you see - he is basically just a centrist liberal complaining about the results of the policies which his political segment pushed for over 40 years. As long as any politician is socially liberal enough, its ok for him. Even if they wholesale sell entire country to private interests - like Starmer.

He is not a rare breed. The West is full of such socially progressive, economically right-wing centrists. Who ruin the societies they live with their voting choices, then complain about the results.