I re-read the OP. Aaannnd ... of course, our doctor lives in Kep. That place is awash with the type of person who believes in TCM, homeopathy, reiki, and astrology.

What I think has happened is Mr Doctor tried to appeal to everyone in his hope of attracting a business partner and given the sort of person he would have been acquainting himself with down in Kep this affected how he worded the OP. He probably thought the residents of Kep were typical of the type of person who chooses to relocate to Cambodia.
Read the OP again but this time read it as an all-encompassing advert to attract anyone who might partner up with him. If this is true he is obviously willing to bend his morals to suit whom so-ever comes forward. His back-peddling and defensiveness of pseudosciences in his replies is in line with this theory too. Given this insight (if true) it would seem our good doctor lacks a certain sometihng I can't quite put my finger on at the moment... but there's something lacking if all the above is only partially true.

Of course, given the boldness of my claims I would be happy to be proved wrong and if that were the case I would gladly offer an apology and a beer

My personal opinion.

What is a 46 year old medical doctor doing not treating patients in Germany or not working in general at the time when the need is so high? Especially in Obstetrics + Gynecology / Psychiatry?

Sorry, but 30-60s (possibly 70s) especially 40s are prime years for a physician to be of service.

As for the more complicated issues. Ones need to apply to the medical council in Cambodia to practice medicine in the Kingdom of Wonder and register to set up a business. Are you familiar with the local medicines used ? It’s a hodge podge of stuff from Russia and other places. Not the brand names commonly used in Germany.

Your whole business proposition is confusing to say the least. Good luck!

This is all my personal opinion.