I don't understand where the hang up is. The response you quoted was from a thread about 55/60m runs. There isn't really any race distribution in a race that short….run the whole thing as hard as possible. In longer races (as discussed in this thread) there may be an advantage to a submaximal acceleration due to the effect that it may have on the latter portions of the race. Either way the real acceleration (i.e. first 20-40m) is going to be essentially the same. In the 100m any throttling back typically takes place in the 40-60m range…so the first 20-40m of a 60m race and a 100m race are practically identical. I guess what I'm saying is that even when an athlete intentially distributes there effort over the course of a race the difference between maximal and submaximal is very slight.
This brings to light a common problem among younger and less experienced athletes. That is, many lack the ability to distinguish gradations of effort and pace. A lot of athletes can't tell the difference between 95% and 100% much less the ~98% and 100% efforts that might be used in a well distributed race.