From the report:
The aircraft did not immediately start to descend, likely because it was moving too fast to descend on the given approach profile from its current location. Subsequently, the crew lowered the landing gear to slow down the aircraft and expedite the descent.
The flight crew then selected a higher target speed on the flight control unit (FCU), increasing it from 180 knots to 190 knots, and finally to 200 knots, likely in an attempt to increase the vertical descent rate. The descent rate increased, reaching 2000 feet per minute (fpm). However, the aircraft also accelerated, reaching 198 knots, when it should have been decelerating.
