If you read the context given in the report, it mentions that this is done to change the plane's ILS rating from Cat-IIIB to Cat-IIIA. While I have absolutely

If you read the context given in the report, it mentions that this is done to change the plane's ILS rating from Cat-IIIB to Cat-IIIA. While I have absolutely no clue what operational/financial reason there might be to do this, I would guess they want to reenable the servo at some later point. (The plane might also just not be certified to operate without that servo; as shown by this incident the servo still has some impact even when it's disabled.)