The IRS will not remove his status in their database even after the amended return has been processed. We see this occur thousands of times each tax year where the dependent did not correctly enter their dependency status on their tax return resulting in the parent's having to mail their tax returns.
You will have to print and mail your 2022 tax return keeping him as a dependent on the return.
See this TurboTax support FAQ for how to print a tax return for mailing when using the online editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-mail-return-turb...
