What about the fact that the reed boats on Lake Titicaca look like the reed boats Ancient Egyptians used to make? Huh? Huh?! My favourite contentious potential

What about the fact that the reed boats on Lake Titicaca look like the reed boats Ancient Egyptians used to make? Huh? Huh?! My favourite contentious potential sign of cultural contact is the extensive usage of sweet potato (native to South America) in the Polynesian Triangle. One of the signs that convinced Thor Heyerdahl to launch the Kontiki expedition, but he assumed (for various reasons) that contact must've gone South America -> Polynesia - things like the prevailing currents and winds being east to west. However, given what we know of eastward Polynesian expansion, that it tended to occur during El Ninos when the currents and winds change in the Pacific, I find it more probable that the seafaring Polynesians who settled some of the most remote islands in the world, travelled to South America and then back again.