Well, looking at that video, I think the incidents are totally different. Mitro's was very clearly arm as a weapon, vicious elbow, easy RC.
In this clip, the attacker's arm is being held by the defender, he is trying to get out of the lock, the attacker's forearm catches the defender on the nose. I count 1, 2 even 3 potential offences by the defender - not that that prevents the attacker from committing an offence - and I wish we could see the reverse angle in real time - but I'm not convinced there is anything more than a careless use of the arm here. And I think the DFK should be against the defender for the foul (s) on 41-42".
(But, if the ref sees arm-as-a-tool then OK, YC. I'm still giving the DFK the other way!)