I do understand what you’re saying and bow to your expertise. I do know though that what we find has survived for thousands of years in some cases (I think) around a spring that is used by range cattle. It seems that some are unearthed by wind or rain or perhaps the cattle overturning rocks and dirt that amaze me in their condition.
That said, I’m strictly amateur at this.
When I was younger I found many beautiful black obsidian points in the sandhills of east Idaho near Blackfoot. Many survived intact because there hadn't been any destructive erosive forces except maybe a horse or lost cow's hoofprint. One of the biggest finds of Anglo-Saxon gold objects took place recently in a much-plowed field in England. There was remarkably little damage from hundreds of years of farming, cattle pasturing and land cultivation. It's a wonder that they lay, some on the surface, that long without being noticed.
So I don't call the spearpoint discoverer a fraud. I just want better proof.