That photo has a carrot in it, isn't that too many carbs for Keto? ;)
Joking aside, I think Keto makes sense in isolation, if you think about the demands of an extreme duration sport like Iron Man, or Ultrarunning, double Century. Where there is no top end required, just a constant low hum of energy.
The problem is that if you go full Keto, which takes a long time, then you can't train effectively. In order to raise sustained power output, you have to do high intensity work to get things working more efficiently. So overall I suspect you would end up with a lower power output.