Considering how violently the Knesset is fighting over conscription, I seriously question this narrative you're presenting.

He's talking about the military filtering process. Who the military considers as "the best" depends on its needs. Simply put, if needs more fighting bodies, so that takes precedence. The Knesset is fighting over public opinion - who gets conscripted in the first place. It's who gets put through the funnel in the first place.