Why did they only have the 2 hypotheses, the "copy paste" and the "magic spell"? I would think a 3rd hypothesis is that a legal document is trying combine two i

Why did they only have the 2 hypotheses, the "copy paste" and the "magic spell"? I would think a 3rd hypothesis is that a legal document is trying combine two incompatible cognitive modes, natural language and logical rigor, so arising this convoluted spaghetti style. Their experiment would not test for this possibility, since storytelling is inherently unrigorous.