When the top middle of the ThrottleStop FIVR window says Locked, that can usually be unlocked by following the method in the video.
When the FIVR window says Not Available, that means exactly what it says. The 11370H does not support undervolting. There is no feature available that can be unlocked.
The method in the video you posted applies to some 10th and 11th Gen CPUs but it does not apply to all of these CPUs. The unlock method definitely does not apply to your CPU.
Starting with some 11th Gen CPUs and all 12th Gen and newer H series CPUs, the undervolting feature is Not Available. No one has discovered a trick to make undervolting possible.