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Author here. I mention in the article that this deviates a bit from Agile/Scrum best practices. No guarantees on estimation quality (impossible to do for software) but it helps to provide a rough order-of-magnitude guide for innovative/never-been-done-before projects.

This method is more accurate for types of software projects that have already been built (web stores, etc.) since it's easier to know the difficulty of the components of those projects.