I'm sorry Lefty he has. On multiple policies.
Before the leadership election he pledged to increase corporation taxes, afterwards he whipped the party to vote against such increases. Before the leadership election he pledged to defend the NHS, recently his right hand man Streeting says privatisation will continue. Before the leadership election he pledged to put the environment "at the heart of everything we do" and to promote human rights, now he wants climate activists put in prison. Before the leadership election he supported nationalising energy, now he goes on Marr and says no way. Before the leadership election he pledged to support workers rights and trade unions, last year he whipped the party to abstain on spy cops in unions. He pledged to unite the party and spends his first two years expelling members and gerrymandering the leadership election rules. He pledged effective opposition to the tories in parliament and a few weeks ago his lords didn't bother turning up to vote against the elections bill.
Come on Lefty, lets be honest, there's a world of difference between how Starmer has acted as leader and what he presented himself as in his leadership campaign. You're perfectly entitled to be happy with him as leader and like the above list but realistically you can't tell me nothing changed before and after he was confirmed in his post.