I would say code 570 has nothing to do with CA. Ca would not have filed for an offset until some time after the period to pay the $24 had expired. that code 570 may also be the reason you haven't gotten your 2021 refund. only the IRS can tell you why they placed a code 570 on your 2020 return.
if CA had placed an offset you should have been notified by mail of this. you should contact CA about the $24 because additional penalties and interest are accruing.
