Over the last 10 years I have had experience with small business taxes, small business retirement plans, and various estate-tax avoidance schemes. The tax code is a joke. It rewards people who have the resources to game it, and it employs an entire class of people who specialize in doing just that. Its demoralizing, but while it exists, everyone has to play the game.
Edit: Also, that same site has an even more detailed summary of the deduction here:
https://evergreensmallbusiness.com/sec-199a-qualified-busine...