That's probably a two button hold method that gets talked about. But Lucid recommended not to do it and it can cause damage to the vehicle. Only technicians should be doing that one
The safest way to fully reboot the car is to press and hold the air logo in the preferences app on the Pilot Panel for 20 seconds.
It will do a clean restart of the infotainment system, unlike the "two button" method, which is routinely discussed on the forums and should not be used.