The article describes all that, but it never says what is new. If you Google "brooke dethick" you'll find that the argument about coats of arms has appeared in lots of previous work about Shakespeare. The other details are even less obscure.
Yes, I read that paragraph. It's anything but clear: "It’s at this point in the story that Wolfe discovered “the smoking gun”. In the Brooke-Dethick feud, it becomes clear that “Shakespeare, Gent. from Stratford” and “Shakespeare the Player” are the same man."
What specifically did Wolfe discover? Certainly not the Brooke-Dethick feud itself: https://books.google.com/books?id=EAuvCFM2S34C&pg=PA183&lpg=.... Perhaps new information about it? Surely the Guardian's readers could handle a detail or two. It's after all customary for an article about a new discovery to say what the discovery is.
This is interesting, but what specifically did she discover? The article is confusingly written and never makes it clear what the "smoking gun" actually is.