Ive just gone back and had a good look at that in slo-mo/freeze frame. Its a clear foul. Dubvrakas going up in a perfect situation to catch the ball and Bolys hands and arms appear on both shoulders and then Dubvrakas going down not up and sideways not straight. At the exact point where he doesn't catch it, it looks like a wwf chokehold hes actually covered his face with his arms and yanked his head backwards. It goes off Dubvrakas inner arm as a result and bounces into the net.
Very skillful by Boly in real time he jumps with the keep and the whole foul happens in a flash. Thats a 100% var overturn though, imo.