I'm 5'9", so by their chart (measured with a 1" shoe, so the 5'10" line) I would max out at 180 with a large frame, and I'm pretty sure (don't have calipers handy) I'm toward the upper end of the "medium frame" scale. For medium frame, they're saying max of 163.
Granted, they say in the explanation that their numbers are based on lowest mortality, so it is somewhat scientifically based. But the numbers still seem awfully low.