Even if he was 24 at the end of 2022, if his income was less than $4400 he can be claimed as a qualifying relative dependent. It is not a mistake. You can still get the $500 credit for other dependents for him because he had too little income.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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