The end of the article states that everything it discussed prior is only part of a "toy". It is known that the toy being studied does not fully correspond to our universe.
Think of coming up with one of these theories like writing a complicated computer program. Sometimes the whole task is too big to even think about, it you sort of understand one part of it, so you work on getting that part sorted out as best you can, and hope you can somehow figure out the rest of the program later, and it'll be useful.