He's right - - overclocking any laptop is crazy. It will overheat and probably something will get permanently damaged, at the very least it will become unstable and keep shutting down.
Build a desktop PC if you want to be able to overclock, there's more space inside for air to circulate, plus you can fit additional cooling components like fans or water-cooling.
Overdrive only shows the active GPU, and that's the Intel one. AMD GPU is not active at this time, so it's not shown.
Overdrive is not for laptops anyway.