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That quote you provided.
It's not really important on kid's bicycles, however on the bigger model, you'd expect them to provide such information as there are people who are shorter than average would like to know.
They're right it's not exactly comparable because the kids bike are designed purely for growing children and the geometry reflect this, not for an adult who finally stopped growing and required a proper fit (as in a bike that's comfortable, rather than saying they need a bike fit).
Let me quote one thing from the articles.