That is the perfect example of why the current interpretations are a crock of shark. By any sensible definition of the term active, Berisha had an active role in that, because by being there, he forced Muscat to lunge at the ball like that and slot it in the near post.
Alternatively, a lack of skill in muscat's attempt to clear the ball lead to the own goal; there had appears to be an onside player on the far side of the goalie, why should play have ceased if Berisha never became active?