That's still looking at things the wrong way round. Even in your quote, it mentions the need to control for things like cardiorespiratory fitness.
The conclusion that muscular strength will always improve your health does not imply that other things are useless! (And note that the linked routines does attempt to improve muscular strength, but the whole point of it was to be something you could do without special equipment.)
The conclusion that muscular strength will always improve your health does not imply that other things are useless! (And note that the linked routines does attempt to improve muscular strength, but the whole point of it was to be something you could do without special equipment.)