Jehovah Nissi is The LORD My Banner is a Myth because Nissi means My Miracle.

Exodus 17:14. And the LORD* said to Moses, “Write this in a book for a memorial and repeat it in the ears of Joshua, for I shall utterly blot out the remembrance of Amalek from under heaven.” 15. And Moses built an altar and called the name of it Adonai-Nissi, The LORD* is My Miracle. 16. For he said, “Because the LORD* has sworn that Yah will have war with Amalek from generation to generation.”