Regardless of my lack of knowledge of HPV rules the example is not all that relevant to real world riding since there is no climbing and the need for acceleration is minimized. I may be mistaken about the assisted starts. I thought I recalled from the distant past reading about assisted starts due to the very high gearing used. That may have been from something like John Howard's 152.2 mph speed record which was motor paced and maybe assisted start as well,my memory is not clear on the specifics.

82.3mph and a weight of 60 pounds was mentioned for Diablo II. I am pretty sure these are "flying start" times right? Correct me if I am wrong but that is probably a long un-timed lead up run and the speed is timed through the "traps" that are a couple hundred meters apart. There is not much in common with any riding any of us are likely to do.