410.4(D) pertains to hanging, cord connected or pendant fixtures. Sconces are none of these. Sconces are allowed above or to the side of bathtubs if approved for the location (wet?).
Hydromassage bathtubs are in 680.70, there are no additional restrictions on wall or ceiling fixtures above that for an ordinary bathtub. Sconces are allowed if approved for the location (i.e. wet location if necessary).
I think the confusion stems from the rules on hot-tubs. Article 680.43(B) covers fixtures over or around hot-tubs: Above 7' 6" with GFCI, or 12' without.
Recessed and covered wet location fixtures are allowed with GFCI below. Sconces (unless of wet-location construction and GFCI protected) are not allowed within 5 feet of a hot-tub unless they are above 7' 6" with GFCI protection or 12' without.