"Up to around three to four minutes, the best pacing strategy is to allow a slow down at the end."
Uh... so he's saying that all those sub-4 milers should go out hard and death-march it in to the finish? Most good mile performances (that are under 4) end with a FAST last lap.
Typical sub-4 mile splits:
Sub-4 mile you almost never see:
^And this runner would certainly be capable of more with better pacing.
I agree with a lot of what he said, and he definitely has better credentials than me, but you can't say that it's best for those 4-minute milers to positive split their race. If it was, we would see a lot more sub-4s being run with a super fast first couple laps and then a death-march. Instead we see most of them ending with exciting, fast last laps.
Up to 3 minutes, I would agree with the positive split approach.