The author of the article seems to not know what they are talking about and has conflated a bunch of different things such that it makes no sense.
But one fact we can be reminded of is that there is no global taxation law for tax residents in Thailand and there may never be one.
Honestly, if there was one, what rich person in their right mind would open themselves up to the revenue department of a notoriously corrupt country to plunder whatever they wanted from their accounts? Nobody, of course, the wealthier they are the less likely they would be to stay.