Rhino.DocObjects.InstanceObject in Python

I am using this script to import geometry in Grasshopper from 3DM files. In my 3DM files I have also some blocks, for which I'd like to use the BlockExplode component in Human to get their geometry and attributes. Unfortunately the data that i retrieve using the Python script is of type Rhino.Geometry.InstanceReferenceGeoometry and not of type  Rhino.DocObjects.InstanceObject which is requested by the BlockExplode component.

Do you have any suggestions on how to retrieve the InstanceObject in Python?

Thanks,

Giuseppe