the iges is being imported as a surface, not a solid. (well, technically it's coming in as 4 small solid disks, near the feet, and 1 surface) and surfaces aren't visible in idws by default.
Either you need to repair the surface and turn it into a solid or leave it as a surface and enable the surface-visibility in the idw (expand the part and "surface bodies," then right-click and select "visible" - as my attached image):
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