I struggle to believe that someone would find it worth that much money to have a decompiled version of a game they also commit to keeping private.
Reading between the lines:
"The avid reader of my blog might have noticed that I had previously written two posts that have since been removed. Everyone else might now be wondering which game I am talking about. To both of you I can only say that corporate America was here to ruin our fun."
Keeping it private likely wasn't the original plan...
The tone of the blog suggests they are using the game to build out tooling and expertise; the capability to decompile large projects on the scale of AAA games is not worth nothing, e.g. security or "competitor analysis" that lays trade secrets bare.
AI is a great at laundering code, I thought open-source software was the prime prey, but I should have thought bigger.