How he knows the aircraft had enough energy to reach the touchdown point without thrust I'm not sure. Maybe those rocket boosters he mentioned previously.
Retracting the flaps from 30 to 20, descending until approx 200' then flying level in ground effect and extending the flaps as the speed decays worked in the simulator enabling touchdown on the threshold of the runway.
What all that ignores is that in the simulator the event was expected, reaction to the power loss was immediate and the plan had already been formulated. The BA38 crew did not have that luxury and so really the exercise was a little academic.
It is by no means meant to imply that the crew should have done better.