We know it is him because the story he told (the questioning, wanting to see his phone, search, etc) lines up with the official report.I agree. Believe me, I could talk about that all day... but there are better things to discuss.
Getting back on topic, how is it known for sure that the person mention in the report is BDD? Does/Did WDW Crane know BDD personally to make the connection? As I said above, I don't really follow Orlando news, so I have no idea how credible that twitter account is.