Yet to recieve refund

My father had filed his taxes for 2020 incorrectly. He made a mistake with my mother's death on the form. The IRS then charged him more taxes. (I had him use Turbotax last year because of this mistake. ) He amended the taxes to deal with the issue. He received a letter last year saying that they accepted his correction and that they owed him around 1300 for a refund. The letter said he should receive the check shortly. He never did. I did hear on NPR someone talking about there being a huge number of people that are in the same boat, waiting for their refund. My question is whether there is a way to enter this on this year's filing? Or does he just submit this year's filing and see if they IRS deals with the refund when they review it? He owes money this year so he will be submitting a payment with the filing. Also, I made sure to supply his bank information. Last year he got a small refund via check. I figure the bank information would make the problem quicker to resolve, though the IRS should have that because he got his Covid relief that way.  Thanks