Van, the Bible, the Watchtower and Polycarp and co are or were in the business of tall stories. John Fox however, apart from partisan remarks against popery and getting carried away with the sentiments of the period, was an early user of original source material for the historicity of some of the public burnings he recorded.
We will remain naive and damaged with the gullibility and intellectual vulnerability of children all through our lives if we stick to the Bible as if it were true.