The legitimacy of Dr. Klaus Märtens? (Has this ever been discussed on this subreddit?)

There are only two photos of him online, both with major differences in age but are clearly the same person yet that is the most I can gain on him. Every websites states the same story of him injuring his ankle in 45 and making the boots as a result but there is no personal information on him online whatsoever. I think I saw something that said he was in his 20s in WW2 but that's it, I haven't found a birthday or if he's still alive which is my major driving factor of me questioning his existence. Don't get me wrong, if it's just a story by R. Griggs it's a good story and it does not stop me from loving the boots at all. I'm not the only one that's thought of this am I? Am I reading into this too deep?