gav0106 we have a bit of a mystery here since according to the Wiki on this thread the aircraft in question has the exact same seats as all but one of the B777 fleet. It has had them since its refurbishment some years ago. It certainly had them in November 2015.
The last sloping seat A330, the three class A330-300, A7-AEB, has just been refurbished. So there should be no sloping seat widebodied aircraft in the fleet.
So a mystery that needs solving!