"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
I had to look that up to be sure there wasn't a massive leg-pull being performed. It really is a genuine DVD. As you say James, we clearly don't know everything about WWI. Perhaps Guderian teamed up with H. G. Wells?
Well James, I too thought this was a leg pull but it appears on Amazon.com, what amazes me is some people actually bought it and gave it a good review......... what is the world coming to......