Again, I don't think the nature of the secret drone intelligence is conveyed very well in this draft of the scenario. I run and play a lot of investigative horror scenarios and a "Here's what's going on" paragraph is crucial for the GM to understand the scenario. Putting in your explanation of the drone network and how it works in an early paragraph would fix a lot of my issues.
The point of a mystery is the clue hunt and eventually piecing together the story of the crime, haunting, or whatever. You need to at least answer the core question of "Why is this place abandoned?" You do have an answer in the drone intelligence. Not having an explicit answer is fine for tangential stuff that can just be eerie, but you should have an answer to that core question and clues for PCs to get a good approximation of what happened here.
If you are releasing a scenario for wide release, it needs to be written for other people to be able to run. I think the scenario has a lot of potential, but it needs some revisions.