Yes, pilot can override the ATS anytime during landing flare even with the system engaged and therefore he/she must be ready to take corrective action in case of high sink rate below 50ft (well, it’s highly recommended at least). Note: the autocall system really helps during landing flare, but pilots have to pay attention in case of callouts faster than usual and it isn’t abnormal to hear when the system skips from 50ft directly to 10ft… if the landing flare is not properly executed at 10ft a hard touchdown can really be expected. Power reduction (in auto) is almost imperceptible and engines noise is completely inexistent on the flight deck, as well. Additionally, it’s not unusual to see a sink rate increase during the runway alignment (compulsory procedure) after an approach using a large crab angle.