I disagree.
What the article is trying to point out is that the 9.9% thinks he's not so wealthy, so he is against inequality, but he still, somehow, for his own comfort and merit belief system, likes his higher income.
Trying to talk about ranges of income, would it the top N%, is pointless.
You could strip out the hypocrisy like so: "I am not at the top, so I am still against inequality, but I am comfortable, but since I AM NOT AT THE TOP, YOU CANNOT BLAME ME, so blame the richest". This is the core problem about stretching inequality, because individualism makes people work for their own selves, and NEVER encourage anyone to "take one for the team". The whole story is about how people perceives their own selves. This is an important debate.
I'm sure those 9.9% would be very surprised they belong to the top 10%. The graph of income is always growing exponentially, yet for some reason people are throwing away the idea that they might be the ones to blame, because people will naturally find argument that they're not to blame. It's always the responsibility of someone else.
I personally have not lived the wealthiest life there is in term of income, but you know, at least I don't complain, because when I compare it to the rest of the world, being in the lower 50% or 60% or 30% in a modern and developed country is still a pretty good life.