I'm reading they took off from T1 intersection at runway 9 which is only ~8500 feet, vice 13,000 for full length, not much for a fully laden 777-300 destined for Doha. They probably "forgot" to get new performance data for the intersection and used their full length thrust and flap setting.
Wonder what the reason was for an intersection takeoff? Not much is generally gained from that in any normal ops for a large/heavy jet, apart from runway behind you right from the get go, in this case a significant amount of runway.