@John *********
It is the typical Thai way to keep rules as unclear as possible. Because you can't hold a "Permanent Residency" in any country anywhere so easily.
The DTV was tailored for digital nomads. Many digital nomads leave their home country for good, they give up their resident address. They de-register. For a digital nomad, the World is their home, their residence.
The use of the word "permanent" is confusing, because most countries only allow you to become a "temporary resident". This is too complicated for Thai Ministry logic.
If I leave Germany for good, being a digital nomad, I "de-register" in Germany. This is called "abmelden".
After this I have no more resident address in Germany any more, no more mandatory health insurance and no more tax residency if I don't earn any income in Germany.
I will still have a German passport but I won't be a German resident anymore.
All those German expats living in Thailand with their Thai wives, have a German passport but no more "residency" in Germany.
They don’t hold a residency in Germany and most importantly of all, never would they hold a “permanent residency” because they are not registered in Germany any more.
The real question is: is the passport enough to be the proof of residency?
Actually, no, it is not. I can have a German passport but if I do not live in Germany anymore, if I "de-registered" before migrating to someplace else, I have no more "residency" in Germany.
I would have to RETURN to Germany, rent a flat, and register myself again. Only after that I would be a "resident", again