I've read Wigan Pier. I've read his criticism of socialists. And nothing in it precludes him from being a socialist. However, the hysterical reaction to it by other socialists proves it hit the mark.
"Socialists" are largely bitter unsuccessful upper-middle class or above and speak in academic babble that is completely offputting to the actual working class who they claim to represent. And this (to the great pleasure of capitalists like me) ruins any chance of them succeeding. It's just as true today as it was when Orwell pointed it out in Wigan Pier, and it's why you came with an ad hominem instead of saying he is incorrect.
What a surprise! I'm sure it's just a coincidence.