It should indeed be worth a look. Originally it was planned to shoot in Malaysia, as it was thought that the script might not be acceptable to Thai authorities, as it doesn't show them in a good light. However money talks and in the end it was agreed that it should be shot in Thailand. Even then filming there had not been completed when COVID struck and filming was suspended in March. The final week of filming that should have been in Thailand was subsequently filmed in the UK(it's a UK production).
The story of Sobrahj is indeed an extraordinary one, and I recall following it at the time while living in Bangkok in the late 70s. What I didn't realise until now is that we actually stayed in the same small apartment block in Saladeang at the same time. There but for the grace of god........!
https://www.theguardian.com/tv-and-r...harles-sobhraj