I’ve had the opportunity to make several “simulated single engine” takeoffs in DC-9 aircraft (not the simulator), from initiation of takeoff roll, using one engine at idle power and the other at takeoff power. The throttle has to be advanced slowly and steadily while maintaining a good grip on the NWS until the rudder becomes effective. Yes, the takeoff roll is longer, but it got into the air every time.
I'm sure you did, given a low enough TOGW and a long enough runway. But I don't think the AF90 folks had that luxury.