I get that any Labour leader needs to build a coalition amongst the left-of-centre, but Starmer seems to be targeting voters that are simply not going to vote Labour.
In doing so, he's alienating more voters (the left and remainers)
His gamble is that, like with New Labour in 1997, those to the left of centre will see ejecting the Tories as more important than anything. Additionally, many from the left (and I'm not talking far-left here, but even the mid-left) in 1997 assumed much of the 'Tory-lite' rhetoric coming from Blair et al before the election was just froth to appease the centrists and 'soft Tories'. Those people now have a precedent when they look at Starmer. And, of course, politics has become more fragmented and 'special interest', 'thanks' in no small part to the Internet and social media.
By jettisoning some of his pledges (on policies that are actually popular with the wider public) and backing himself into a corner, not with ruling out seeking to rejoin the EU in the next Parliament (which is actually a correct call), but by ruling out the SM (it was totally unnecessary to do so), he's going to lose support.
All this may be moot anyway, though. A few journos are confident that Durham Police are going to issue a FPN.
Wonder if Burnham could find a safe seat suddenly open up...