Read through it. Didn't see anything about Squanto chugging Coca Cola with Santa and the polar bears. I only looked through the drop downs that would seem to have that information and didn't find anything relevant. If I'm looking in the wrong spot, direct me to the right one.
It says that it was
originally formulated to be medicinal and uses certain ingredients that can be used medicinally. But once you combine it with whatever else they use to make it taste good and stuff, it doesn't seem leave much for therapeutic value.
Carbonated water
Sugar (sucrose or high-fructose corn syrup (HFCS) depending on country of origin)
Caffeine
Phosphoric acid
Caramel color (E150d)
Natural flavorings[55]
Everything else beside this about Cokes formula is top secret. Of these known ingredients, they don't seem very medicinal. Hell, did native Americans have access to cacao? That's a South American thing. Caffeine is on occasion used for headaches, as it helps relieve pressure by doing something with the blood vessels around the brain (as well as probably around your whole body). Carbonated water is used for stomach aches (bicarbonate of soda, and if pushed Sprite is the closest you can get if needed), but that's it on its own. Again, once adding all that high fructose corn syrup probably isn't good for that.
But throwing this all aside. This was invented in the 19th century (1886) sure, native Americans were still around (and are still around, I meant in their tribal state). But "Coke" was invented /after/ the Civil War. Yeah, I don't think ancient native Americans were using it. Perhaps they used a certain ingredient, but that's not the same as saying they drank and used Coca Cola medicinally.