The Seismic Anchor Movement defines the absolute displacement of the restraints included in a spectrum shock case for independent support motion analysis (ISM). This displacement is applied to all restrained nodes in the node group, and is used to calculate the pseudo-static load components representing the relative displacement of the individual restraint sets.

This option is only available for Dynamic Analysis, when Earthquake (spectrum) is selected as the Analysis Type.

So in answer to your specific question, SAM is considered as part of the (dynamic) inertial loading.