I think you are referring to the fixed-layout devices. Since those layouts are fixed, the subcircuit model calls the device model with a given W and L, so the subcircuit no longer takes W and L as a parameter. The test data and plots in the PDK repository are something I did, not SkyWater. The purpose was to check that we didn't break things with the conversion scripts. I intend to use the same/similar checks for the PDK continuous integration system that we will hopefully be working on this week.