When the EVAL expires, nothing will happen unless you reboot. If you reboot, the license will not be activated.
The following are the restrictions for configuring and using RTU licenses.
To activate a license, you must reboot your switch after configuring the new license level.
An expired evaluation license can not be reactivated after reboot.
Stack members of a switch stack must run the same license level. If the license level is different, the switch will not join the stack until it is changed and rebooted from the active switch of the stack.
That is just a command that has been deprecated it. I don't think that changes how the license function.
Starting from Cisco IOS XE Fuji 16.9.1, the Right-To-Use (RTU) licensing mode is deprecated, and the associated license right-to-usecommand is no longer available on the CLI.