Hey man, how are ya? I am a very small creator as well, so you don't have to specify that haha!
Honestly, it doesn't tie into the game at all, other than the PTSD the prisoners suffered from the experiment. It is just an easter egg and a way to bring a little attention to the horrors of what the piece of shit communists did to my people. The faces you see on the walls are the political and mostly religious prisoners of the experiment, a lot of which are saints today. I'm really happy somebody actually looked into it!
Thank you so much for the awesome comment, brother, I really appreciate it. Good luck with the documentary and your channel, I hope you make it big one day!
God bless.