Relief from fusarium patch on the green?

If there is no need for such a local rule, why is the following in the Model Local Rules (not sure if I misunderstood the question):

E-4
Relief from Aeration Holes

Purpose. Aeration holes do not fall within the meaning of holes made by the maintenance staff or “damage on the putting green” in Rule 13.1c. Therefore players are not allowed to repair them on the putting green or take free relief from them in the general area or on the putting green, but such holes can interfere with the proper playing of the game.If the Committee declares aeration holes to be ground under repair, a player may find it impractical or impossible to obtain complete relief. Therefore, when aeration holes may significantly interfere with the lie of the ball, the Committee can choose to give relief for a ball that lies in or touches an aeration hole. This Local Rule should be withdrawn when the aeration holes have healed enough to avoid significant interference.

Model Local Rule E-4
"If a player's ball lies in or touches an aeration hole:
(a) Ball in General Area. The player may take relief under Rule 16.1b. If the ball comes to rest in another aeration hole the player may take relief again under this Local Rule.
(b) Ball on Putting Green. The player may take relief under Rule 16.1d.
But interference does not exist if the aeration hole only interferes with the player's stance or area of intended swing or, on the putting green, on the player's line of play.
Penalty for Playing Ball from a Wrong Place in Breach of Local Rule: General Penalty Under Rule 14.7a