Don't be snarky when you might be wrong in no less than 2 ways:

1. When they say

    A JPMorgan survey of more than 100 billionaires, reading ranked as the top habit elite achievers had in common

They are not asking billionaires about other people ("elite achievers") they are asking the billionaires about themselves, and the writer is using another term to avoid repearing "billionaires".

2. The actual report, which I had tracked down prior to reading the message above, is here, and you can use your own literacy skills to confirm that my point (1) above is the correct understanding:

https://assets.jpmprivatebank.com/content/dam/jpm-pb-aem/glo...

> We explored with each principal how they spend their time, what captures their interests and how they view the world across several key areas. While each principal’s experiences are unique, common priorities emerged.