He should answer No.
From the IRS: If you were claimed as a dependent on someone else’s tax return for 2020, you were not eligible for the third Economic Impact Payment. If no one can claim you as a dependent for 2021 and you are otherwise eligible, you can claim the 2021 Recovery Rebate Credit on your 2021 tax return.
See Eligibility for claiming a Recovery Rebate Credit on a 2021 tax return
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