At each point that you've asked for justification for my viewpoint, I've tried to give it. I've shown how the viewpoint begins with the cultures studied. I've shown how it's affirmed by other cultures, either through matching symbols, comparable words, comparable myths, and/or comparable traditions. I've shown how the representations made by these ancient cultures correspond to known scientific facts. And I've also shown that the cultures themselves are in close agreement as to how they acquired the knowledge. To rephrase:
Ogo (counterpart to the Egyptian Light God Aakhu) plays the role of light in Dogon cosmology. The Dogon claim that the "step or measure of Ogo" was used to measure out the physical universe, then give us the dimension as 8 billion steps, which is - in fact - the diameter of the physical univers in light years. The Mishnah tells us explicitly that, on one symbolic level, a cubit represented a "step". The Egyptian word for cubit is Aakhu Meh - a compound of the Egyptian words "Light" and "Measure". The combined term Aakhu Meh would correlate to the Dogon concept "Ogo's measure". I would ask if you see any reason in this to possibly think that a cubit might represent a light year? In my opinion they have all but hit us over the head with it.
The phrase that would have applied when I grew up as a kid in Salem, Oregon when someone was being uncooperative beyond reason was:
What do you want? Egg in your beer?