I think the report you heard is confusing maximum projected rainfall with flooding due to storm surge.
3.2 meters of rainfall is just not possible.
The National Hurricane Center has projected maximum rainfall to be 40 inches (slightly more than 1 meter) in the worst-hit area. Most of the region threatened by this hurricane will get considerably less than 40 inches of rain.
Sea-water flooding due to storm surge (incoming 30-foot-high, wind-driven waves) is projected to be up to 11 feet deep (3.4 meters deep) over a wide area near the coast.