I may be mistaken but I think this particular article was discussed a little while back. Although the title of this article is "Oldest evidence of arrows found" there is no evidence that these points were, in fact, arrowheads. They could just as easily be points for light throwing spears or even atlatl darts. The article states that these points were "probably arrowheads" and were "tips of projectiles". Unless stone/bone/wood(?) points are found attached, or near to, arrow shaft(s) or are found in conjunction with ancient art (petroglyphs, etc...) depicting bow and arrow use or even with the conclusivly proven remains of a bow it will be hard to prove any projectile point was in fact an arrowhead.