No, because in your scenario the people who have $1.25M in assets now are going to have $6M in 23 years (invested at the same rate), so these high earners still won't end up in the top 10%.
This is, I'm sure, is what the parent means. Compared to people with capital, people on high incomes are always behind.
If you earn more than average, spend less than your peers, and invest wisely then you might move up a bit on the wealth scale, but that's it.
I think the idea is that some of the people that have $1.25M now are not going to be around in 23 years, and that money will have gone to [inheritance, eldercare, etc], so who makes up the top 10% will change simply because of demographics.
This is, I'm sure, is what the parent means. Compared to people with capital, people on high incomes are always behind.
If you earn more than average, spend less than your peers, and invest wisely then you might move up a bit on the wealth scale, but that's it.