Mostly i'd just say - false flags are extremely high risk. You don't do something like that just to get france a little bit upset with Iran. If you are going to go for a false flag, you do something extreme as that is the only way for the expected pay off to counterbalance the severe risk.

The most important part of a false flag is to have media support pushing the false narrative before any alternative narratives have a chance, and Iran definitely doesn't have that. The uncertainty about who was attacking and these late revelations make it even less likely to be a false flag, IMO. Everybody was expecting this to be the Russians.