Nate is one of the nastiest guard submission srtists there is. If you knew anything about bjj he just rolled with Conor and went with the momentum like any good grappler would do. You don't fight force with force in this art.
Here is is toying with a black belt in Kurt Pellegrino and being able to just use his guard to create a triangle allowing him to flex and flip off the crowd while cranking with his hips.
The only thing they're right about is that mcgregor was not dominated on the ground; he was owned. His soul was taken from his body.