a 50-year-old "opinionated Everyman"

Books Lost Conan Doyle book to be published:

"The Narrative of John Smith was written when Conan Doyle was 23, and just a few years before the author published his first Sherlock Holmes story, A Study in Scarlet. It tells the story of a 50-year-old "opinionated Everyman" confined to his room by gout, laying out his thoughts and views on subjects from religion to war and literature through the conversations he has with his visitors, from a retired army major to a curate."

Excellent. But is it canon?