The confusing thing here is that - pre-Colonisation - I'm not sure there was any such thing as a "Relay Installation". The option names in colonisation don't line up precisely with the older set of entity names when you target them in game.
Here's what I had as pre-colonisation installation types.
- Agricultural
- Civilian
- Comms
- Industrial
- Medical
- Military
- Scientific
- Security
- Tourist
- Unauthorised
So "Relay" and "Comms" both giving you different types of Comms Installation model (but perhaps with different colonisation effects) is a possibility and somewhat makes sense.
Similarly "Satellite" isn't an installation type at all in that sense - but some of the installation models come with one or two nearby satellites (at least some of the Civilian and Medical, and maybe some Scientific)
On the other side, nothing
says it builds a Civilian Installation, but presumably some of them are. And the cargo on the Civilian Installations varies if you scan the holds - some have drinks and rares (though not quite the same pattern as a Tourist Installation) whereas others have mining or agricultural equipment (again, not quite the same pattern as an Industrial or Agricultural Installation)
Well... I just finished this one today :/
Does it count as a Relay for dependencies, though? (for the Security Installation, I think)