No goalposts have been moved. The proletariat has never been defined by income level, rather simply if they sell their labour without owning capital. A vanishingly small percentage of the proletariat has been a millionaire or equivalent basically forever.

Capitalism is private ownership of the means of production, nothing more, nothing less. If someone really is able to produce 20x more than their peers, there's nothing wrong with them have a before tax income of 20x more.