Interesting.
I am not surprised it is hotly disputed. It is hardly heavy weight. No basis in eyewitness and Spanish accounts. Whoever wrote this must think that south of the border nothing green grows. I am astonished that it is being read at all. I wonder what real historians would make of it.
Just think of all the very lovely food stuffs that came from that part of the world and the huge population not the product of man eats man society. I believe there is some basis for a scenario akin to man eats man at one time in the Easter Islands but even then I am not sure the consumption of human flesh was as blahsay as pork chop night!