Irori knows fractionally more than other gods, or so He believes, and is not particularly a fan of Asmodeus.
He's not a fan of Zon-Kuthon either.
He is less yet in favor of unnecessary conflict between major deities.
There have already been multiple divine interventions meddling in an issue I consider foolish, and one of some concern to Otolmens; she is understandably annoyed. While I do not think we stand in danger of imminent destruction, I would fully advise that everyone listen to Her about this and comply fully with the spirit as well as the letter of Her instructions and not meddle here any more.
That said, this same record of previous divine intervention, and the timing, suggests that Zon-Kuthon probably already had His warriors on the way when Otolmens issued Pharasma's Edict and is not in direct violation of it. I doubt He had such an army already assembled and waiting, to be directed straight into Otolmens's interdicted region almost the moment she issued the Edict.