Hmmm - just had a thought which may end the confusion here.
I did not bring anything into Thailand when I came here ! It was my WIFE who brought it in !!!!!!!!!!
It was her name on the documents, her passport we submitted and her (parents) address as the destination. It was simply a case of HER returning to Thailand to live after a spell abroad.(I just 'tagged' along
I am guessing that the advice you are being given about a work permit etc is if YOU yourself want to import the goods (i.e. - as a single Farang man)
"Non-Thai, holder of Thai Residence Visa for at least one year."
I take the above statement to read 'non-immigrant visa'. You are not coming here on a tourist visa as a tourist , you are here on a non-immigrant visa which means it is your intention to live here for a period (1 year at least) for a reason other than tourism. Doesn't that mean you are resident here? albeit for only a short time, but you are actually living here!
I say again I did NOT have a work permit and was never ever asked for one. My shipment was absolutely painless. And for the record too - I did not ship out all my household belongings it was just personal things (even 27 boxes , but small boxes) and my bicycle. I started again once I got here and was a chance to get rid of some of the accumulated junk in my house I had been holding on to for so many years
Paul