> How they managed to squeeze all of that inside such a tiny device is baffling.

The San-Ti probably use similar technology they use to create sophons: by unfolding a proton to get access to the 11 dimensions it "occupies", which makes it very very large, giving access to insert circuitry and building an advanced computer. Upon completion, you can ask it to fold itself back to its original size.

The author of this review doesn't know about the Three Body Problem ig lol