The only correction that I would make is that we now have better astronomical measurements due to satellites and computers and I would suspect the date would be more like 12,000 years ago. But that still makes Tiahuanaco the oldest city known on the face of the Earth.
The mystery of this map is it shows Antarctica as it looks underneath the ice long before Antarctica is even suppose to have been discovered and perhaps the greatest mystery of all is that it shows the Antarctic peninsula not as it looks today, covered by more than a mile of ice, but as it actually looks underneath that covering of ice. Now we ourselves have only known what the land under the antarctic peninsula looks like since 1958 when seismic surveys were taken across the ice cap…the clearest deduction of all is, whoever drew up those maps thousands of years ago, had a level of technology as high as our own. They had explored the whole globe from north to south and from east to west. So this is testimony of an advanced and as of yet unidentified civilization in remote prehistory.