As to fluting, yep it's tricky to do but not as dificlt to do as you might think if ya know how. In fact true points are so valuable, and fakes are made so well, that unless you know what to look for, (size, weight, material, chipping pattern, thickness, patina, ect.), they're impossible to tell from the real McCoy. Even "So called" experts can be fooled. That's why I refuse to buy a piece. All mine are personal finds by me or my son. Just one fake found in a collection will cause the whole collection to be suspect. I collect for personal reasons as my father was full blood Cherokee, not for monetery value, but I still keep the integrity of my collection pure.
As to the bows, there was a lot more involved in making one than the article states. Particularly in how the wood for the bow was treated and cured. I made my first, with help of course, at 8 years old from Hickory. You can't find a better wood than Osage Orange though. As to poundage, the numbers the article states, is ballpark figures at best. There might have been an average weight draw but I doubt very much there was anything close to any set weight. Remember, you didn't have a factory kicking them out. Each was made by the owner.
As to horses, it's commonly acepted that the Spanish brought horse to Tutle Island. I tend to be a bit more practical in my beliefs. In otherwords I, nor anyone else, was there so who's to say?