From what I've seen they offer the original owners a cash buyout in addition to "stock." Have you ever seen that stock actually pay off to the original business owners that it was issued to?
The only deal I was a part of, the original owners got all cash, which was great for them because the common stock went to zero. The basically sold the company for a great multiple, after their best year. They killed it.
So the PE firm bought this family business, put 20 million in debt on the company, hired a bunch of highly paid middle men, tried to expand the business and failed miserably. Unfortunately, the company I worked for a the time and still do today, formed a strategic alliance with this company after the PE firm bought them. The owners in my company were offered preferred stock in the new company and ended up losing 90% of their money when the company was on the verge of insolvency and was sold to another PE firm.
The new PE firm that bought the company was called Benson Hill. Another group of highly educated, dumb people that with enough money, thought they could turn the business around. They went public as a spac. Went public at $10 and is now trading around 25 cents. The ended up folding the business after building a brand new 40 million dollar facility, that was promptly sold for 20 million about 6 months after completion. So much dumb, cheap money was running amuck when interest rates were low.