It's not completely wrong. I never said the owners cash out entirely. But in terms of the company raising money, the IPO is pretty much it.
Perhaps I was a little too loose with my terminology though, to the point of being confusing. Instead of "owner" I should have said "company" in that paragraph.
You said: The owner(s) of the company only gets paid at the IPO. That's the only time he gets money from the stock market (unless and until the company issues more stock later).
This is totally false. They get paid anytime they sell stock. They sell some stock at IPO and get paid some then. It's by no means the only time they ever sell stock and definitely not the only time they get paid by the market.
Perhaps I was a little too loose with my terminology though, to the point of being confusing. Instead of "owner" I should have said "company" in that paragraph.