Changes to retirement visa income affidavit requirement for USA citizens?

I saw the following posted in Chiang Mai by a visa assisting company.
Urgent; If you are a USA citizen and use an affidavit for your retirement visa extension, you will now need to show proof of the amount declared. This can be a statement from social security or your pension provider. Please note the amounts have to match the number stated on the affidavit. This is for renewal and for first time applicants. Please request for these statements now as they can take time to obtain.
Is this true also at Jomtien or other locations? What if ones income comes from other than Social Security or formal pension? This is the case for many who were self-employed.