These lectures are different from his famous Lectures on Physics. The lectures you linked to were compiled in "Character of Physical Law" and are not related to his Caltech undergraduate courses where he presented his "Lectures on Physics" content.

You link to: https://en.wikipedia.org/wiki/The_Character_of_Physical_Law

"Feynman Lectures on Physics" are: https://en.wikipedia.org/wiki/The_Feynman_Lectures_on_Physic...