Actually has anyone considered that he was always going off the end of the runway?
Perf A RTO Performanc only gurantees you'll stop within the "Accelerate Stop Distance Available" (the ASDA ) and that is not neccessarily within the Paved surface of the runway, but can be in the stop end beyond the usable Take Off Run Available (TORA).
Admittedly in this case if there is a Stop Way it doesn't look much up to weight bearing capability.
Only thought here is that he used the wrong data i.e. Dry instead of wet or even a TESCO instead of an ASDA ?
(sorry guys but thats a Ground school Classic in the UK)