Flow rate within the system is one of the greatest factors not just the radiator size. I would say the three greatest are the radiator, air flow and water flow. Clearly the temperature it can achieve will back up their claims.
I expect Kraken and Corsair pumps are very similar.
Their claims are clearly with nothing to back them up.
They give no data for Kraken X60.
They only clain H100i outperforms anything currently on market.
And that is not true or substantiated! Pure and simple.