Two facts of Atlantis

you think ?

Edgar Cayce 1933
This brought consternation to the entity, and also those influences the application or use of which brought destruction to the land. And Poseidia will be among the first portions of Atlantis to rise again. Expect it in sixty-eight and sixty-nine ('68 and '69); not so far away!

he of course doesnt say anything about it being anywhere near Bimini at this time
those details were added later by the A.R.E. and are cobbled together from seperate reading made some time apart.

its like
something happens and they say "look he said it would, we just didn't realise at the time"
they seem unable to predict anything until after the fact
bit like the bible code in that respect really

the greeks didn't know about America
so S America is out

How do you know? It has been proven that an Egyptian reed ship can indeed make the voyage, and with primitive navigational instruments. The Phoenicians were the expert sailors of the world, so it is indeed very possible that they and the greeks DID know about the Americas.

Not to mention, there are plenty of pre-Columbian (i.e. before Columbus) artifacts found such as depictions of African people, elephants, etc. which clearly show that South Americans were at least somewhat familiar with such things even prior to Columbus. Likewise, there are Egyptian mummies that contain strictly South American plants.

the idea of Atlantis being on the american continent was first suggested by Edgar Cayce
while he was asleep

That's one opinion. Of course, Plato describes exactly where it should be, and that description fits South America very nicely.

the "altiplano" is the spanish word for "high plain"
are you saying the Atlanteans spoke spanish

You're not serious right? I in no way suggested the Atlanteans called it the Altiplano. Jeez...

I strongly urge you to actually read Plato's writings on this. A simple google will turn them up. You'll also see that Plato assigns Helenistic (Greek) terms to the things he describes, and he makes it very clear that he is doing so. We're not talking about a Greek-like Atlantis, he simply uses terms familiar to Greeks to allow the audience to better visualize the place.