No he would have to file an original 2022 return. Sorry it's too,late to start a 2022 online return or use the mobile app, either on Turbo Tax or the IRS. And too late to efile 2022.
If you need to start 2022 you can buy the Desktop download here,
TurboTax 2022 Prior Year Tax Prep - File Past Years' Taxes
You will need a full Windows or Mac to install it on.
If you have a simple return and want to file for free you can fill out the forms by hand. That would be a good learning experience for him.
Here is the 2022 1040 return
https://www.irs.gov/pub/irs-prior/f1040--2022.pdf
2022 1040 Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2022.pdf
