They did a few years back. AFL warns players that jumper or gut punches will now lead to suspensionsThey haven't . Incidents get put into a rubrick that spits out a penalty. The rubrick gives a lesser penalty for hits to the body than to the head. And then when assessing impact they also give it a lower grading as it's less likely to cause injury - eg a head shot that left someone writhing on the ground in pain, but without concussion or any other injury, wouldn't be deemed low impact.
Clearly there was a shift and they have relaxed this rule whereby it’s likely to only receive a fine nowadays.