The variables listed on the chart include Loft, COR, Launch Angle, Spin and Climate, so there are a lot of things that influence the total carry. The way I interpret the chart is that the two diagonal lines going up to the right equate, more or less, to quality of contact (smash factor). So the tour pro that has a 110 swing speed probably has a smash factor close to 1.50, which I would interpret to be the diagonal line to the right (optimum). That would give a carry distance of 250-255. That sounds about right for the shortest hitters on tour.
The average golfers with much slower swing speeds probably also have less than perfect contact, which would tend to put them closer to the left diagonal line. Except on the internet, where a smash factor of 2.0 or greater is achieved, and 100 mph swing speeds routinely result in 300 yard carry distances.