From my experience percentage of Indians with good English exceeded that of Chinese in Silicon Valley, I always thought this observation was due to that fact.
Honestly, this is probably the easiest and most accurate answer. India being a british colony for a long time means that the top 1% of Indians had a lot more exposure to English than the top 1% of Chinese people.
From there, statistics comes into play. There's just a bigger pool of Indians to select CEOs from.