OK - well, he's got a point, if overstated.
Starmer said lots of things to get elected as party leader, and has backtracked an awful lot of them in order to woo the centre ground, and the moderate right.
Which is the percentage play as an election strategy, but goes against what members voted for when they voted for him.
Ultimately, and IMO, for a GE... I don't think much of it will matter much. The politically aware and motivated will see all of that, but they'll also see him as the adult in the room compared to... anyone on the tory front benches under BJ or LT. But the 98% of the population that only look at politics when there's an election around the corner will still think "Tories deliver a stable and upwards trajectory for the economy, and my pocket, Labour overspend on inefficient public services" despite being demonstrably wrong on both counts. If they remember the politics of 2020-2022 it'll be "the tories paid my furlough when I couldn't work, labour didn't even have my back when I felt forced to go on strike". That's also the story the right-wing press will paint, whilst the "neutral" press engage in both-sideism, and the left wing press shout in the wings and engage in same internecine internal warfare.