S-parameters: do they include via inductance for common-source FET transistors?

[Terminator3]

For example:
**broken link removed**
Reference plane is placed at 1.3mm from device center (at 2.6mm diameter, where leads just touched the substrate).
But also there are substrate parameters given:

NE3511S02 RF MEASURING LAYOUT PATTERN (REFERENCE ONLY) (UNIT: mm)
RT/duroid 5880/ROGERS
t = 0.254 mm
εr = 2.20
tan delta = 0.0009 @10 GHz

Substrate used is t=0.254 mm + many vias to ground on source pins.
All those vias (inductance), is it included in S-parameters?

 

[FvM]

All those vias (inductance), is it included in S-parameters?

Obviously. The s-parameters are measured with the given fixture.