Hi guys. I just decided to register for an online account and was able to see the RFIE online. Thanks to @Family , I learned that as long as I dont withdraw form G-28 under "Case Actions", mail notice will be sent to both my address and the lawyer address as stated on the G-28 form.
Back to the main point. As most of yall have already guessed, the RFIE is for I-864.
So my lawyer did include bank statements showing sufficient amount of more than 20k on his savings account, but she only included January 2022 and the most recent bank statement to show how consistent the savings amount is within a year. According to the RFIE, they mentioned "Bank statements covering the last 12 months" in the first bullet for "Acceptable evidence of assets". So I see where the flaw is now.
Nevertheless, just to be on the safe side, my aunt will get on board to co-sign for our affidavit of support I-864.