From my most recent update in my investigation:

I need people who have viewed !kerbalspaceprogram@vlemmy.net to check their browser cache for this image:

https://vlemmy.net/...

You can do so using one of the following NIrsoft tools:

• Chrome: https://www.nirsoft.net/...
• Safari: https://www.nirsoft.net/...
• Opera: https://www.nirsoft.net/...
• IE / Firefox / Misc: https://www.nirsoft.net/...

I'm hoping since it's a historic image linked to their internet presence that it might generate specific leads.