I didn’t, and wouldn’t, say that.
There is also the handling of the Covid crisis. Labour haven’t put up any alternative policies or exerted any positive pressure on the government since April, but they’re still benefiting from the poor management by the government - any opposition would, once significant portions of the press started noticing that their lives and the lives of their readers were being negatively affected by government policy.
I’m not going to deny that Corbyn and his progressive, liberal, internationalist policy platform put some people off, or that his inability to magically stop Brexit put others off, or that switching to a pro-second referendum platform alienated people in leave-voting key marginals.
However, yes, if you’re looking for reasons why Starmer has managed to bring Labour to a polling position they last held just over a year ago, then the ceasing of the continuous, hysterical, well-poisoning by members of the PLP and commentariat is the one that has removed the ceiling from the party’s poll numbers.