Trump's point is that there was a huge spike in mortality in the wake of the storm? OK, if you say so.
That's the knock on Trump's response. He's been acting like the only death count that can be reasonably attributed to the storm are those deaths where there is a clear cause and effect on the individual basis -- e.g., the wind blows a tree down, it falls on someone's head, and she dies. If you restrict yourself just to those deaths, the death toll was fairly low, just as is the case with nearly all natural disasters. The way those disasters become deadlier are through the statistical deaths -- the deaths from elevated disease rates, from worsened nutrition, from diminished health care, etc. That's what those studies of the disaster in Puerto Rico are looking at, which is very similar to how previous studies of large disasters have worked:
https://www.researchgate.net/public...y_in_Florida_during_the_2004_hurricane_season
Those are the deaths for which politicians can most reasonably be held responsible. There's little a president could be expected to do to prevent a tree from falling on someone's head while the hurricane is raging. Those immediate deaths are often impossible to prevent, or can only really be prevented by the local officials who are in place to order evacuations, etc., (and whose zoning policies, staffing decisions for first responders, etc., may have set the area up to be more vulnerable). But a president can have an impact during the weeks and months following the storm, in making sure that services return to normal as quickly as possible, reducing the degree and duration of the the mortality elevation in that period. In the case of Puerto Rico, it took almost a year to return the whole island to 20th century standards for infrastructure. Just basics like working electricity were denied the people living there for months on end. That's the kind of thing that can result in a longer-term elevation of mortality, and it's also the kind of thing competent presidential intervention could help alleviate.