honestly the tech company person is probably not - I was just thinking of someone who started a what would be derisively called a "lifestyle business" and has basically retired earning a couple of million a year. Most small tech founders are still working for their crust.
What I don't like about the middle class definition is that it is to my mind just a subset of the working class but designed to drive a wedge between people who should be looking out for each other. It has the effect of attempting to align working class people with super rich capitalists. Interesting that "middle class" was the original name for the capitalists who were between the working class and the nobility, now we pretend that the middle class are working class adjacent.
I like the definition I provided because it seems functional to me; it describes classes with labor-capital relationships, and describes how the incentives influence their behavior.