They can still resell their laptop. They just need to google "how to resell macbook" and find this Apple support document and follow the instructions. It seem

They can still resell their laptop. They just need to google "how to resell macbook" and find this Apple support document and follow the instructions. It seems pretty easy and specifically mentions the T2 security chip. https://support.apple.com/guide/mac-help/erase-your-mac-mchl7676b710/mac https://support.apple.com/guide/mac-help/erase-your-mac-mchl...