This announcement was less about FUMA and more about the impairment to FY17 accounts.
This reads like an additional impairment on top of those disclosed in the preliminary final report. There was no further impairment until FUMA was pulled in September. So they're bring forward bad news from September 2017 and taking the hit in the period from 1 July 2016 to 30 June 2017. At least, FY18 would have a lower PCP.