He is right of course but it’s a moot point.
The public will recall and be constantly reminded by opposition parties that a former member of Johnson’s cabinet is now the PM(whoever wins) and at every opportunity be lambasted for covering for it being a part of Johnson’s diabolical, lying, law-breaking time in office.
They’ll have it dragged up ad infinitum that they sat back as he partied in lockdown whilst the country followed their rules, none of them challenging him on his behaviour, just endless ‘one more chance’ and ‘benefit of the doubt’ blind loyalty of substance that got them where they are.
Starmer must up his game massively in the next 6 months, he needs new script writers for a start.
Either way he’ll probably end up as PM after the next GE but of a coalition government.
He’s not exactly Mr Charisma but he’s now deemed competent and trustworthy, more as a result of Johnson’s actions than any performances of note of his own.