Eh, it's better than some of what I've seen from stand-up practitioners coming up with ground stuff. I don't think he has a ton of grappling experience.
The stuff from top of mount is valid, especially against someone who isn't an experienced MMA fighter. That said, it's not hard to be effective from top of mount against an untrained opponent. I could add some details to make it less dependent on speed and power.
The defense from bottom of mount is so-so. The trap & roll reversal is an important fundamental technique, but the entry into it could be improved.
The armlock from inside the guard is super low-percentage.
The stuff with the opponent inside his guard is valid, but missing a number of important details that would make it more effective.
I think he would be effective against a typical untrained street punk just by virtue of size, strength, speed and aggressiveness. In terms of technique for handling someone who is trained, or bigger, or both, he has significant room for improvement on the ground.