Very nice finds, Clear of Conflict...I admit I was still a member of the "Old School" thinking about when to blow the boots, but then I haven't flown with boots for a few years now. However, the video seems to be saying the Old school thinking may still actually apply to older airplanes and, in any case, refer to the POH.
All of which re-enforces the conclusion, in my mind, that many of these issues are not at all clear cut or something anyone should expound on without proper research and background knowledge, least of all the Brylcreem Boys from the Media