The difference is Trump only counts those killed instantly by the storm and found within the first few hours. According to him, those who died later due to starvation, disease, injury, lack of medical supplies, power, or weren't found immediately, ie. did not die of the hurricane rather because they didn't have the foresight to protect themselves from days and weeks of privation or die where there bodies were convenient to find and count. It was their fault, not the storm.