Because “recursive self-improvement” is widely understood, even at labs, as having a non-trivial chance of eradicating human life.
This is like asking why a paper called “I discovered God. This is the specific proof.” is revolutionary. Just tedious levels of incredulity.
Anyone who seriously believe that and isn’t being hyperbolic for shock purpose is delusional. It’s a pretty standard research paper, you cannot assume any research that contains the terms RSI to be revolutionary