Good estimation CONFiture! My perf manual shows ALD for 60t A320, on wet rwy, conf full, 10kt tailwind, at 3000 ft amsl to be 1600m. However I operate under JARs and RLD for me in this case would be 1.92xALDdry and that's 2120m.
I cannot comment on TACA's required margins, though.
Also 60t is an estimate. At the time being, we don't know if it was the real weight. We don't know what was the speed over the fence. We don't know where was the touchdown point. We don't know when the braking was started and if it were manual or autobrake. we don't know wheteher spoilers were deployed. We don't know if thrust reversers were activated. So untill FDR and CVR are read out, at least 85% of this thread will be pure speculation.