Again, I agree.
It seems that players have a fixed size quantum of training that they can be exposed to. I don't know if it's a limitation of the human body, or a limitation imposed indirectly by the AFLPA, or a limitation of hours in the day, or some other limitation ...
... But when a player is out kicking the footy, he's not in the gym doing leg curls (or vice versa). And we've heard of coaches complaining about not having enough access to players - implying that any time one coach spends with players is time another coach is not.
Strength development could be compartmentalised as being a specific, explicit program (probably with weights) designed to improve the strength of particular muscles. And conditioning development could be compartmentalised as being a specific, explicit program of doing aerobic activities such as treadmills / bicycles / etc.
Or a player could just spend that time out on the practice field running around kicking the footy. Does that mean that player will be as weak as water and have no aerobic capacity? No - for two reasons. Firstly, it's unlikely to be absolute one way or the other. Things might (for example) go from 60:40 to 40:60. Secondly, the act of running around the field and kicking the footy likely does contribute something toward improving fitness - 'fitness' being (physical) strength and (aerobic) conditioning.