It's not exactly Boris Johnson level bullshit though really is it?
Starmer became leader just weeks before Covid. That was one of the biggest economic events in the last 100 years. Since then we've had the Truss crash, the war in Ukraine, and all three contributing to the cost of living crisis.
For many of the economic promises, the world is a different place to when he was trying to become leader.
I'll give you that there were plenty of worse to placate Labour members, and he's not followed through with that. The only defence I'd give is that for years we've laughed at the Tory members because they want a leader that reflects what they want - and most of think that means someone who is batshit crazy. While we might say that our own views are correct (and I am certain my own left wing utopia would be much better than anything Labour have said they'll do), it's useful to look in the mirror sometimes, and ask if we really are the best people to pick a leader who will win elections.