Those items will be available via the backer portal - I've already got the cookbook - not sure if all the items are up yet or not. I think some things, like the documentary, are still not available
I was referring to the backers portal in my post. My friends and I all bought the Digital Download Plus and for some reason we hadn't got any of the backer items at the time of posting. They just finally showed up in the product list 12 hours after launch so I'm guessing it was something to do with that particular backer level.