I was wondering that too but then why are they even asking for that in part 6 No. 8?
Do you really think it's just the sum that made them send the RFE requesting a sponsor? From the other RFEs for I-864 that I saw here on VJ who were just missing supporting documents or missed a field, they never asked for a sponsor in the RFE. I wonder whether USCIS thinks that his VA Disability is too close to the poverty guidelines. $24,650 poverty guideline vs $28k in VA Disability (sorry, I wrote 26k before, it is $28k).
If we respond to the RFE and it is wrong again, are we risking a NOID?