It's very easy to get the splits calculo.
You can see the clock display 11 seconds. If you watch the video on a computer video editing software you can note down that time and work out the splits using the footage.
It's really very easy. You could even do it with a crude method of pausing the video when you see the clock, and then starting a stopwatch as you click play on the video.
Just go and do it yourself. From when 11.x seconds (I don't remember exactly now) shows on the clock, Korir crosses the 400m mark 38s later. You can also use this to calculate the first 200m.
49 mid is a solid pace for a ~1:15.
You can work out his last 200m with a stop watch calculo. I got 25 low over and over, it's easy. You can see exactly when he crosses the line at the start and end of the lap from the same angle.
The guy racing next to him dies badly and so Korir looks extra spectacular.
You can check the first 200m against the previous method I put forwards by taking away the easily timed last 400m from the total finishing time.
I can read, thank you, but that doesn't mean I accept your opinions. The 600m is not the 800m