This is incorrect. Rule 25(f) specifically states "...but these lights shall not be exhibited in conjunction with the combined lantern permitted by paragraph (b) of this Rule." 25(b) states that a sailing vessel [...they] may be combined in one lantern carried at or near the top of the mast.
THE PICTURE FOR THE RULE EVEN HAS SIDELIGHTS ON A SAILING VESSEL WITH RED OVER GREEN LIGHTS.
THE PICTURE FOR THE RULE EVEN HAS SIDELIGHTS ON A SAILING VESSEL WITH RED OVER GREEN LIGHTS.