Hi, no, everything's fine. I was just not sure before buying as the description clearly says 16x16 and doesn't mention the other sizes. I went for it anyway though and yes, they do have x2 and x3 sizes.
One thing though... either I am blind or there are no autotiles in x2 and x3 sizes (only in the basic one)... I mean the tiles in the picture below, they are only in the base tileset in the terrain.pgn file it seems.