I am impressed with your knowledge of exotic pistols.
Yes, it was originally designed by Willi Korth, which was well before the current Korth owners (who designed the PRS) were in the picture. Korth's factory is now located in Lollar. Willi's original company was located in Ratzeburg. The Korth Autopistol was not a blowback. It used a falling block locked breech design, similar to that of a Walther P38 or Beretta 92, but aslo with some major differences.
I'm fortunate enough to own a couple of them and have had them for years. Honestly, I doubt I'd buy another today even if I could find them with the prices they command. That being said, they are exquisitely made handguns. Willi died before he completely perfected the design, but I love them the way they are.