What are the current requirements for renewing a Non-O retirement visa in Thailand regarding pension income?

They shouldn't be asking for that because you're using the affidavit of income embassy notary letter and if you're from a country whose embassy here still issues that document that's about all you need (although some want to see how you get that money, pension, etc). The only time you have to show a year of incoming transfers is if your embassy doesn't issue the income letter and you're using monthly income method by international transfer method <- that's where you show the 65K baht a month transfers for the previous 12 months. Certainly go to your immigration office before your extension is due an see what's what..