Seriously, that’s how much a doctor makes while carrying $300k in student loans. Yes, these are US numbers, and I’m sure France has both lower salaries and much lower or no student loans. But the point stands that $400k is a really high salary but not necessarily wildly wealthy if you are paying more in student loans than you do for your house.
What this will accomplish is force newly rich people to stay in their class while the wealthy class people get no change at all since they don’t have a high salary. The wealthy stay wealthy while the poor have no chance to become wealthy, only merely rich.