the aircraft eventually left the ground, but, by 170 m (558 ft) beyond the end of the runway, it was able to achieve an altitude of only 70 cm (2 ft) above the ground. Subsequently, it took out a 200 m (656 ft) stretch of strobe lights at the end of the runway and continued to climb with difficulties. At 350 m (1,148 ft) beyond the end of the runway, the landing gear hit and damaged the 180 cm (6 ft) high localiser antenna array operated by Airservices Australia. At 500 m (1,640 ft) beyond the end of the runway, the aircraft barely missed the 2.24 m (7 ft) tall airport perimeter fence. It was also reported that after clearing the airport perimeter, the aircraft cleared a small brick building by only 50 centimetres (20 in)."
TOGA @ an IAS of, for example, 130kts will not give the same climb performance as TOGA @ the correct IAS for the actual TOW, say 160kts.
The aircraft in this ficticious example would have been 30 kts behind the drag curve and most of the added power would gone into overcoming the drag to keep airborne, rather than translate into rate of climb. All imho.
130kts is 67m/s so the localiser antenna was 5 seconds from the end of the runway but less than 3 seconds from getting airborne! The perimeter fence at 500m was only 7 & 5 seconds respectively.