begin minor rant...
Occam's razor is misused in the manifesto. The author indicates that it means "Prefer simple solutions", which it doesn't.
Occam's razor requires a hypothesis, and generally means "Among competing hypotheses, the one with the fewest assumptions should be selected".
For example, Special Relativity is exceedingly complex, especially if I try to explain it to you. Ontologically though (in actual fact), it's the "simplest" solution to explain the real world data that the speed of light is fixed regardless of reference frame. I could come up with other theories to explain the data that might be "simpler" in explanation, but they require more and more assumptions to be made about the real world. For example, I could say that the speed of light is fixed because aliens cause all of our testing apparatus to show the same reading. For sure, that's a much simpler explanation than explaining Special Relativity. But it rests on a whole huge number of assumptions (like aliens existing, that the aliens want to mess with us, that they have the capability of doing so, etc, etc). So here Occam's razor favors the more complex theory because it makes fewer assumptions.
So saying that something is better because it's simpler and then justifying it with Occam's razor is really an abuse of the concept.
... end rant