Okay? So what? The time frame possibilities with the NEW findings in the Amazon with LiDar is within the parameters of the time written about in The Book of Mormon. Lehi and his family and friends left Jerusalem about 600 BC. They didn’t cross the ocean immediately. And, it would have taken several decades to grow their population large enough to start building towns and then cities. 500 BC would be a reasonable time period. The LiDar reflects this.
There's no evidence of their civilization.