Maybe it's just a clever ploy for Bannon to come out and work with a hack to make a book like this, only to later back down and Trump to use it as a win. It just galvanizes the base when such a high profile situation does indeed turn out to be a load of bullshit and they can use it in the future when the Russia stuff gets even closer? Another victory for Trump in his fight against fake news, all the whilst he's tweeting shite to grab our attention, and it's all constantly distracting from the real issues.
Fair play if this is the case and that's what happens, if it brings back his base supporters at least then it's worked a treat for him.