I would suggest that you are right in thinking it means PR as that is subject to a quota each year.
I moved my belongings in 2010 under Non O status and there was no duty free allowance.
The words " regarded as resuming residents " means returning Thais. A friend of mine moved his stuff about the same time but did it under his wife's name as a returning Thai which carried a duty free allowance.
He did have to pay duty on the motorbike, customs didn't believe it was hers.
BTW. I didn't pay the maritime insurance, premium was a lot more that the value of the goods, but a personal choice.
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