I would suggest that what was said while Napoleon was in exile needs to be taken with a dose of salt. Again, it is hyperbole.
Some of examples of how his generalship matured, was that he learned, not being an infantryman but an aritllerymen, to more accurately judge march rates over different types of terrain based on his experience in Italy in 1796-1797.
He created the militarized train of artillery in 1800.
He created the militarized supply train in 1807.
He began separating his infantry and cavalry into homogenous divisions based on his experience in Italy in 1796-1797 instead of keeping the division of all arms that he inherited with his new command.
He developed and employed the corps d'armee system in 1800.