That's doesn't mean the source information isn't in battle.net. It literally states as the question "What happens if I don't sign up to move my Guardians to Steam", which then answers that Destiny won't be available on battle.net after October 1. I'm not sure how you could not associate the question with the answer?You do not transfer on Battle.net, you transfer on Bungie's site.
Likely Activision-Blizzard will be closing off any access to account information for Destiny after they've officially split as part of the agreement.
I honestly don't understand why you would argue an interpretation of what's stated and instead just transfer your account and character information over before the apparent deadline? Are you planning on getting angry at Bungie on twitter or something because you could no longer transfer after tomorrow?