To me this reads like you've fallen into the trap of assuming Northern voters are more naive or somehow less well informed than those in the South? How does your theory account for those voters in the North who've moved to the Lib Dems or Greens this time?
I don't have a theory - sorry! I am talking about those who voted Tory in some of the so-called 'red wall' seats in 2019 and don't appear to have been won over outside the south. But I think to support your assertion that Labour and Starmer have "deprioritised the working classes" I think you'd have to say which policies in particular, and how they won't benefit the working classes. For example, it is difficult to see why Labour's much-touted call for a windfall tax on some of the big energy companies wouldn't directly benefit the working classes if the benefits of it was directed towards helping working people (and others) to deal with cost-of-living increases.
The fact many of them are still voting for Bojo and his clown troop of liars would definitely suggest they are naive gullible and less well informed than those that didn't. They swallow the right wing propaganda fed them by the press without question and ignore the fact that Bojos relationship with the truth is a very very distant and strained one.
I wonder what the new evidence presented to the Chief of Durham Constabluary is; a provisional invite to become chief of the Met?
The depressing part of your post is that the gaslighting by media has been happening for years. I read references to it from Orwell in the 1930’s and Tressell in 1910’s. The deeply depressing part being that it still works. People are still being convinced to vote against their own interests.