> Then how why would they be the "top" 0.1%? If everyone is equal, there is no "top".

Start from:

If all were almost equal the top 0.1% would be doing more or less as well as everyone else.

Then take the limit for almost -> exactly

s/equal/almost equal/. There still can be a top 0.1% even if they only make 101% of what the bottom 0.1% makes.

Sssh! Don't disturb their precious dreams. The patriarchy will win if you do!