@Steve *********
i think it's more likely a lost in translation and it's written as one or the other in the immigration rules about extensions based on marriage to a thai .
You will need to prove that you have 12 months of incoming overseas transfers of at least 40K baht a month into a thai bank account in your name only.
You can get that from the bank by having them print a year detail transaction history and making sure that the transfer codes on all those were international.