Did anyone figure this out?

[Nor_Treblig]

There were talks about it here:

TWP: which questions would you like to be answered?

I’m perfectly aware that many of the most mysterious questions in Thimbleweed Park are meant to be left unanswered, because part of the charm of the story is that it leaves the player with a lot of ambiguous information to interpret. But let’s fantasize nonetheless a bit about which mysteries an hypothetical “Thimbleweed Park 2™” could help us to clarify (not necessarily in a direct way but hopefully conducting an investigation). For example, I would like to understand who/what was uploaded or…

and here:

Thimbleweed Park theories

I think the ringing phone and modem sound was the Japanese game company hacking into the game. The same modem sound was heard when they uploaded Ray to the Upper World.