The journey undertaken by the author might just have made a book in the hands of a gifted writer. Unfortunately, this reads like a fifth former's "what I did on my holiday" essay. No drunk Bolivian, no majestic mountain peak, no herd of llamas and alpacas, no colourful costume, no passing condor goes unmentioned - and the author encounters many of each. Cuzco is seldom mentioned without being termed the imperial capital.
The interwoven slices of Inca history read as though gathered from a guide book and supplemented by Wikepedia. My belief is that it is only subsequent generations that have known as Incas the peoples ruled by the first Inca and his successors. In their own time they were probably members of many different tribes.
I fear that on a long journey Martin Li would be a tedious companion.