It's humorous. Maze of Death is, like most of PKD's work, full of black comedy. The fake table of contents is funny.
Aside that, and I'm afraid I'm going to state the obvious here: it's another layer of reality, foreshadowing the final plot twist. As PKD says:
in MAZE OF DEATH there are endless parallel realities arranged spatially.
That's the main theme of the novel, and notice how the entries in the fake table of contents form a fairly coherent single reality (which the bizarre dissertation linked by John Rennie in the comments calls a "pastoral drama"), and the story told is of a dark tone that kind of parallels the main narrative. It'd be a reasonable guess that the story of the table of contents is actually an earlier reality generated by the spaceship's computer. Or another layer of reality entirely.
The story told by the table of contents also has something to do with the actual narrative, at least links can be noticed, though the connections are pretty opaque indeed.
I do very much doubt there's any kind code or acrostic is involved. There really is no precedence in Dick's work for such things.
On an aside: the Hungarian translation of the book doesn't contain the table of contents. It was probably too much for the publisher :).