I don’t follow. You are questioning whether casino games have an inbuilt advantage to the house? If they did not, there would be no casinos. It’s a fairly established princinple of business that you need to take in more than you pay out, else you won’t be in business very long.
The BJ professionals calculated the charts and the HA using simulations, not formulas. They write software that recreates a game, and tests the result of each possible player decision on each hand. Done a billion or more times this will provide the correct overall HA and the complete strategy charts.
Unless you have done those simulations yourself, you have no right to question their results, and you look foolish for doing so. You might as well claim that the world is flat, on the basis that you’ve never seen it curve.