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Starmer's going after Labour-Tory switchers in the Red Wall and NOBODY else. Here are some problems with that: 1) the government is going after exactly the same voters by offering them exactly the same things. But, being the government, they're better placed to deliver them...
2) The switching process has been going on for 20 years. Starmer has nothing whatsoever to say about what's been going on for the past 20 years that may have caused it, or what he would do about what's happened over the past 20 years...
3) To the extent that they have any such account of why the switch has occurred, Starmer, via his chief advisor Ainsley, draws on a set of incredibly tendentious assumptions drawn from the work of conservative liberal (yes, he is) political psychologist Jonathan Haidt...
What the resultant analysis amounts to is the belief that the voters they are chasing have stopped voting Labour for reasons completely unconnected to the fact that they Tories have shored up the value of their pensions and homes at everyone else's expense...
...and entirely dependent on the fact that Labour politicians haven't told voters that they love the queen enough. This is a bad, uni-dimensional analysis with a weak evidence-base. but even if it were true it should be clear that Labour cannot out-Tory the Tories.
But ultimately, the people pushing for this strategy don't care. They care that they keep their own red-wall adjacent seats, and their control of the regional party offices. They like this strategy because it justifies driving the left out of the party - not because it can win.