A friend of mine, a senior ex-SAF officer who was in the physical training division, is quite unhappy about the new changes.
According to him, in actual field studies, "pull" strength matters a lot more than "push" strength. Chin-up exercises the pull muscles while push up exercises the push muscles.
Shuttle run relates to assessing agility - the ability to accelerate, decelerate and change direction without drastic lost in speed and this is related to combat task of fire and movement.
Standing board jumps assess lower body strength - again, proven to be needed in combat.
All in, he feels as assessment goes, it is going in the wrong direction. Of course, the bigger issue is the 70% failure.