alt Hacker NewsIs it? Maybe I didn't get far enough into the series, but the parts I did read and the synopsis online are all derivative of old ideas. The "dark forest" idea is a very old and much debated solution to the Fermi paradox, and appears in other works (e.g. the wolves in Alastair Reynolds' Revelation Space series). The VR stuff was derivative of dozens of previous works. The rehydration of the solarians is not that different than the spiders freezing in A Deepness in the Sky by Vinge. Plenty of alien invasion and doom cult literature out there (too much, in my opinion).
But I took Dark Forest to mean the Dark Forest Theory which the post I was replying to mentioned, and that's just a common theory under a new name, which has been a commonly known solution to the Fermi paradox for so long that no one is credited with coming up with it. It's given the "deadly probe" name in a SETI review of the Fermi paradox literature in 1984.
My criteria for originality may be more lenient than yours. I think it would be difficult to find sci-fi that isn't derivative of older ideas to an extent, and it's harder for more recent work to stand out, because basically everything's already been done. Managing to combine a dozen ideas from previous works into a coherent whole is far from uncreative. So I feel the author was original enough in his approach, even though I thought it was scientifically inept.