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According to the author's definition, both Bitcoin and Ethereum have a Nakamoto coefficient of 1 and a Geni value of ~0.92, meaning that they are equally centralized and brittle.

How is the proposed metric any useful in measuring and comparing decentralization of blockchains?

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They discuss this, it shows how both Bitcoin and Ethereum have different dominating factors, how one has centralization in some areas the other does not and vice versa. Use the resulting numbers are the same, but examining how they were arrived at is the interesting point. It's not like positions of two balls at time 0 is the interesting number, it's how their differing properties affect the equations that determine their eventual position.

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