Umm you see how in the laws and interpretations doc you linked earlier how some of them have a reference to a section on the right hand side. That means it further explains, or overrides, that particular rule. Now see how the one you posted doesn't have that? That means it's not relevant to any particular rule in the rule book, therefore does not override the actual relevant rule.
Of course Keary jumped, hence how he ended up a foot higher than the positioning in the photo posted earlier.
You can't attack the legs of someone fielding a kick either. Oh except for in the situation when the ball bounces first.