You got it backwards: Lenovo/IBM never made any swap, though several other manufacturers did. The fn key is still in the same location as when it first appeared

You got it backwards: Lenovo/IBM never made any swap, though several other manufacturers did. The fn key is still in the same location as when it first appeared in the ThinkPad 300 in 1992. That location was more common in older laptops (google some pics of early Compaq LTE or HP Onmibooks), but at some point all brands except IBM and Apple decided to place CTRL in the left corner.