Presumably, if you have a trusted application on a trusted device, the identifier was installed in a trusted way, the device is in trusted possession and the device won't be given to anyone else, trusted computing may be able, in certain cases, to make it more difficult for a remote minor to use the identifier.

> in certain cases, to make it more difficult for a remote minor to use the identifier

Just offer the user some money if he installs some "trusted" app for age verification token sharing.

They are implying the use of trusted computing with proprietary software to ensure that only users on fully “trusted” (locked down) devices are allowed to access network resources.