No, you get one item from the specific pool that this suggestion would effect. There are other items that would be unaffected by this suggestion that may drop when Plantera is killed. So you would get one Plantera pollen, and then you might get the Axe and/or the Plantera trophy and/or the Plantera mask and/or the thorn hook and/or a pygmy staff and/or a seedling. The only items that would be affected by this are the grenade launcher, the venus magnum, the nettle burst, the leaf blower, the flower pow, the wasp gun, and the seedler. That's it.