The fly in the ointment as far as Baumann’s argument goes is that Hitler’s aims were obvious from the time he took over the reins of government. They could have stopped him when he militarized the Rheinland, but they didn’t. Everything he did he had signaled he was going to doing many years before. Only Churchill sounded the alarm. But of course, he was just the crazy, old fool who thought up Gallipoli. Let’s ignore him. Baumann is a disingenuous dope.
Hitler drove tanks into Vienna earlier that same year.
Perhaps that might have been a clue to his intentions.