The aircraft should have been fully configured at 1000 ft including power at approach setting and on the glideslope. At 500 ft they have to have been fully stable or gone around. So,if at 600 ft those thrust levers were at around approach setting and a little increase was demanded for whatever reason , then even if nothing happened they would surely have landed a lot deeper thanjust inside the perimeter fence. If the engines were at idle at 600 ft(and that is only an if),then the aircraft would not have been stable at 500ft in any sense.
Glad it was 27L as 27R has no luxury of plenty of grass inside the fence,and a multi storey car park just outside.