Your numbers are not discussing home field advantage - just home games ... that teams play better at home, which is almost universally true. The question is how much of that comes from the "home" part, and does it matter. The trouble with using playoff home field advantage to glean this is that ... in the 21st century, excepting the World Series, teams with the extra home game are usually "better" than the other team and would be favored in a neutral setting.
The definition of the home field advantage is that extra home game ... the decisive game. I only used World Series results to try to control for the fact that in recent times, the home team in those decisive games is usually the better team to begin with.