The guidance is followed by an explanation that the approach should be flown with it off in case of a go-around and engine detonation, not in case of increased risk of icing as previously postulated.
Just be careful that the reverse policy applies if landing a Cessna single (150 and 172). The POH requires full carb heat on until after landing when it is selected in to Cold before taxiing. Same with go-around procedure in that it includes first full throttle and after that carb heat in to cold. The short time the throttle is full open with carb heat hot will presumably not cause detonation but will clear any ice that may have gradually formed on final.