Don't just link to a post, explain what you think is wrong! We can not read your mind, we can't know what you intend to show by linking to a post.

FWIW, it's a post by Ken G that starts: "There's no such thing as the distance the light travels. There isn't even such a thing as the time the light travels. What there is, is two events-- the emission, and the absorption. How much distance, and how much time, that relate those events are purely given by the coordinates chosen, which presumably are in turn connected to the observables made by a given observer or set of observers. [...]" (bold mine).

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