I agree with the call. Other guy may have even been winning at the time with the kicks before the takedown. After the takedown, Eddie wasn't in a position to do much since their heads were touching each other. Their heads were like that for a while, Eddie wasn't close to finishing the fight or had the other guy hurt at all. Fight had just started. Eddie then starts punching clearly to the back of the head when he couldn't punch anywhere else but there due to how their heads were positioned and rather than stopping when the ref told him to, he just kept doing it and argued with the ref, which was really dumb and worthy of the DQ off that alone.
After punching him in the back of the head several times, the guy fell to his back and held his head, possibly milking it and Eddie swarmed him with legal punches now, but the fight was over at this point and Eddie committed several blatant illegal blows, the last of which eliciting that reaction from his opponent. The ref had no choice but to DQ him after that as they were clearly intentional and Eddie refused to stop throwing the illegal strikes even after being warned.
Then in the post-fight interview, he said he was touching his ears with the shots, but on the replay, you can clearly see his punches were miles from his ears and directly to the back of the head (his opponent's ear was touching his own head as their heads were together for quite some time before Eddie started punching him to the back of the head, so there's no argument of his opponent turning his head as he was punching or anything).
No idea why people are mentioning JDS. JDS was standing, turned his back and walked away from his opponent. Not even in the same universe of scenarios. In this instance, they were on the ground, their heads against each other for a long time, then the illegal punches started (so no argument of him turning his head right as he started punching or anything or attempting to "bait" a DQ).