Having previously read authors like Fest and Kershaw, this book presents an absolutely revolutionary view of Hitlers life and situation. Not being a historian I have no idea how to reconcile New information like this
There is always more to be said, of course, but the estimable u/commiespaceinvader has led a couple of discussions of Ohler and his work here, and you may find it helpful to review those earlier threads while you wait for fresh responses to your question: