The article itself says that is hasnt been concluded who built the mound Youve already conceded Middle East links to the region by admitting the X is found in the ancient Americas which is already confirmed by bioarcheology The X came from N which came from West Asia largely found around presentday Turkey and throughout the region One of the Odins ancestors came from the area of modernday Turkey and the X has been found in similarities to groups both in Sweden and ancient America while the Adena mound sites have been found to be similar to those found in Sweden The highlevel of X found along the AtlanticArtic travel routes suggest it could have came to the continent that way but that is for archeologists to determine See  Who built the ancient stone architecture of Canada and New England Richard Thornton August