With 1.3 billion people and practically no sanitation system, you have to have a good immune system or you die.
As it spreads through fecal matter, and Patient Zero in China is November 17, 2019, then it is a certainty that it swept through India over (our) holidays just as it did here, and those numbers are barely hidden under the surface, either categorized as undiagnosed or given over to H1N1 or B/Victoria without actually testing, just as has happened in the US.
Thus like the US, Indian has established herd immunity; but as noted in the article, their over-80 is fractional compared to the US....quelle surprise...