I would agree with that, but then we must define our terms. That nail inside a piece of coal was not found under those conditions. The reason archaeological digs are closely scrutinized and documented is to prevent cross contamination.
I use Occam's Razor to explain things I come across. If I went diving and found a piece of technology in a sediment level that clearly could not date to that period, I would assume that it came from another time. It is simpler for me to believe that than that someone independently of the years of background needed to develop complex clockwork somehow short circuited all the necessary research and development to make a clock that can track the solar system.
The reason that Occam's Razor works is that a simple answer is often the correct one. Trying to tell me that something happened thousands of years before the technology existed, I will never buy that.