“Trump, Obama, George Washington - President does not have total authority.”
I think Trump misspoke when he said the president has “total authority.”
But what the president arguably DOES have, is authority on issues that affect national interests, such as interstate commerce. So, if a company in, say, New York does business outside of New York, that would fall under interstate commerce. A president would NOT have authority over a shop that interacted solely within the borders of the state within which it resided, although the federal government would have jurisdiction over that company under certain circumstances (for example, in the event of constitutional violations).
I see you have ignored the Wickard-Filburn court decision.