After doing pretty well in the previous snap general election.

The difference being that in the more recent one, he was out-manouvered by the left of his own party and forced to allow Labour to take an explicitly anti-brexit position.

Opposing brexit and doing badly at the last election go hand in hand. Even the smears and accusations of anti-semitism were a non-issue in comparison, honestly.

Tellingly, I've heard basically no-one in British Politics admitting this. The topic has simply quietly gone away.