I believe it refers to this article, which uses documentary evidence to show that Myatt admitted to being the founder of the 'Temple of the Sun', which a later text said was one of the groups that formed the O9A.

davenumber7.substack.com/p/david-myat...

w/end reading #2: Smiling Dave did a deep dive in the archives of Leeds public library & found several news articles showing that (quelle surprise) despite his denials founder of the O9A David Myatt was an aspiring satanic fascist all the way back in the 70s.
davenumber7.substack.com/p/david-myat...