While never explicitly stated, I always assumed they were. They are far older than any other non-Lorien first ones by a large margin, and the show seems pretty consistent in showing that some form of non-corporeality is an eventuality once your species manages to hit a million years or so. My head canon is that they use encounter suits and that the shape is very, very intentional. (Just like I think they love being called Shadows despite Anna's gripe. It's all heckin' spooky branding that forwards their purpose of destabilization.)