I should say there is no concrete evidence that the Early Rapa nui were from Tiwanaku, but most scholars and open minded ethnologist believe this is the case. The similarity between the megalitic stone sculptures at both sites is compelling.
The exact origins of the Rapa nui or Easter island cultures are a Mystery.
The Tiwanaku are also a bit of a mystery , their monumental stone sculptures and enormous religious sites are found high in the Mountains , too high for farming and to high to sustain a culture, yet the site would have held many thousands of people, so why build it? it must have taken decades of hard labor by many hundreds of stone carvers, who had to be fed, so, HOW and WHY?
and where did they go? - it really is fascinating.
The Tiwanaku used San Pedro and most likely Ayahuasca , they had extensive trade routes up and down the west coast of South America, they no doubt had contact with the Northern Peruvian amazon tribes. But San pedro is for certain and shows up in their art works, which are wonderfully psychedelic. It gives me great Joy to know that 1500-2000 years ago these early civilizations took form with the HELP of psychedelics as an integral part of their religions and culture, it was their religion!
Psychedelics helped form these earliest American cultures, imagine what it could do for ours now.
Obviously everything the Shaman says is Hyperspace Hyperbole