You're completely off. Not even in the same zipcode regarding the stats. The article you're citing for your stats says 10% of Indians in the US felt racism from regular Americans. Nothing about caste or internal casteism.

It's talking about the kind of racism you see on H1B threads here, like the outright confession of violating federal law that I once saw in a comment "I stopped giving interviews to Indians because I found they lie in the resume".