Yep, but the fan was protested against and rulled as non-competative after the event..
Three teams have appealed against the FIA decision before the Aussie GP with another team adding thier weight before todays race, surely if thier appeals are held then the rulling has to be set from the date the appeals were filed...
As I said though if FIA allows the race to stand if the diffuser is illegal then it'll be another nail in F1's coffin