Good catch on the typo for the layout options (I corrected it above). KLE layouts can be a bit of a pain.
For the traditional FC980 layout 88 keys are Kaihl hotswap sockets 10 are traditional solder sockets. For my setup I am planning on soldering in Holtite sockets for the alternate layouts. So I can have the benefits of alternate layouts and hotswap (the Kaihl hotswap sockets are superior IMO rather then going all Holtite though I guess that is an option too if this idea doesn’t pan out)
This PCB shot from the back might be easier to visualize the different sockets.