Starmer is all but certain to get the keys to No10 - probably with a substantial overall majority.
A Tory/Reform pact, an increasingly unlikely possibility, could deliver a hung parliament. I expect that if this happens, some sort of deal between Labour and LibDems or SNP will follow.
The Starmer strategy has been to avoid alienating any potential voter, communicate a warn positive message, and rely upon general public distaste for Tories. The Tories are doing themselves no favours in creating the conditions for Reform to flourish.
He is not being open or honest about what may follow post election - individual opinions may regard this as (a) pragmatic electioneering, (b) a failure to face obvious challenges, or (c) lying.
IMHO there are elements of (a) and (c) in the mix. (b) is implausible - the whole Labour campaign is based on assertions of 14 years of chaos and CHANGE. They have had access to civil servants for months as it the case pre-election and have no excuses for ignorance.
The only remaining question is what they will do once in power. Supporters will clearly place trust in his actions over voting for an alternative. Personally I do not trust him but have to simply accept that which happens and deal with it accordingly.