So trying to drag this back to things that we know so far and not focusing on things we're not supposed to know about yet.
What about if the UPs aren't transmitting information to people/lifeforms unknown on Merope 5c, but are trying to illicit a response from it. If I was correct and the UPs have been reverse engineered from UAs, the people who did it have a fairly good idea that something is happening with/on Merope 5c. UPs are found around ammonia worlds because whoever made the UPs is assuming (or knows) the UAs are Thargoid related and so they are trying to find something that will react with 5c.
Keep thinking back to the Thargoid rumours dispelled Galnet and wonder is it really saying everything in that article it debunks as myth is actually true