I can see how this is technically a clickbait headline in its grammatical construction, but in context it isn't really.

Think of it as "[a discussion/analysis of] what Orwell discovered in the North", or "[pondering] what Orwell discovered in the North".

What he discovered isn't a mystery, nor is it the question. The significance of what he discovered to him and to his then future path in life and in writing is the topic being explored.

Wigan Pier mostly.