Mu can mean multiple things in japanese. Using sandman fan theory as objective proof makes you look even dumber than before.
https://en.m.wikipedia.org/wiki/Mu_(negative)
However for the sake of argument let's assume you are right and Imu is a reference to are
Beach problem is the metaphor doesn't make sense because Wano is meant to be Atlantis than why is Imu also called Mu.
Also what way is Imu connected to Wano of course you could say that Imu is the force that caused the people of wano to pit up the barrier but that would make him a stand in for the Gods not Atlantis. As you can see Imu and The land of f Mu connection doesn't hold up.
So In order to prove that Wano was a blatant copy and paste of Atlantis you had to use two fan theories with negligible amounts of proof (Imu is a connection the land of Mu, Imu is connected to the barriers of wano) and even then it doesn't even work as a parallel to plato's Atlantis.
You really are quite Dumb.
Also why do you seem so intent on ignoring all posts on the connection between Naruto's jiraiya and the jiraiya folklore yet still defiantly claim that you have seen no examples mangakas taking as much inspiration as Oda. I guess invincible ignorance is your only available route when you're as stupid as Lee is.