Starmer was somewhat less than truthful when it came to his leadership pledges too, which is an uncomfortable fact rather than any 'trolling'. I know loads of people in here are perfectly okay with that as they just want 'their' brand of Labour and think the ends justify the means, etc.
He's better than the Tories (a very low bar admittedly) and given the choice of the two I'd personally want to see him win, but it's not unreasonable to look at past actions and have a bit of justified suspicion about his newest set of pledges - to a different audience, the electorate rather than Labour members.