Some RF PDKs use a pretty hokey core FET model and
supplement it with a subcircuit "wrapper" that contains
most of the parasitics (FET compact models lacking L
entirely, and their behavior of C vs terminal voltages
may not fit the way you'd like). You should burrow into
the model chain and read the model statements to get
an idea about structure.
A MOS RF switch will have the gate connected only to
a very high value resistor. So the Cds may appear as
the sum of fringing D-S capacitance plus the series
Cdg*Cgs/(Cdg+Cgs) since the gate has nowhere else
to go.
Then, consider that they may have omitted some
details like finger count, total W or whatever if this
was anything like a commercial product with IP to
protect.