How are 16% of Millennials millionaires already?

https://artafinance.com/global/insights/millennial-millionaire

At the same time 39% of Millennials have less than 10k, and 2/3rds have less than 250k.

This seems like the most unequal generation ever. 20% are doing extremely well, surpassing previous generations, and the other 80% are far behind financially compared to the past. 20/80 rule strikes again...