I had asked a question "how is Miami not on the list at all" and then realized that the table is actually an image not a table so I couldn't search it.

It's on the list. #34 out of 72, middle of the pack. Within the U.S. Chicago, NYC, Philadelphia, LA, and DC are above it. Houston, Dallas, San Antonio, and Phoenix are below it. They seem to weight heat-stress pretty highly in their rankings, hence why all the TX/AZ cities are at the bottom and are joined by South and Southeast Asia.

The list is a little weird in that I can't find any population-based reason why Miami would even be on it: it's almost the top-10 U.S. cities by population, but missing San Diego or any SF/BayArea city, while Miami & DC are #41 and #22 respectively. If you go by metro area it explains why Miami & DC are there and why Dallas & Fort Worth are condensed, but not why Atlanta is missing and San Antonio is included.