Very true. Given Starter hasn't announced a single policy (to my knowledge), that is some fall in confidence / satisfaction in the Gov.26 point deficit back in February, March time wasn't it? Only one poll that counts though and that's some way off yet.
Starmer just needs to keep hammering the competence issue and keep the Corbyinite headcases confined to the backbenches.
He could conceively become PM by 'not being Johnson' in the same way that Biden might become President by 'not being Trump' but expect the Tory party to be ruthless and axe BoJo if that looks seriously likely in a few yrs.