From the article:

One thing that is often overlooked is the fact that Wain also continued to produce work in a more traditional style during this time too. The belief that his abstract drawings demonstrate the progressive deterioration of his mental state is quite likely a falsehood – the result of a claim made in a book called Psychotic Art that was published in the 1960s.

So now I’m wondering which claim is true. I’m might need to look more into this at not-2am, though.