Don't agree with all of this either. I've seen Mayoruna and lots of indigenous people purge with Kambo. Not on videos but in person. I give Kambo to lots of natives in Brazil and I am working with an entire community who are bringing back Kambo to their tribe, they all purge. The Katukina purge and so do the Kaxinawa. They have a good diet but heavy on Manioc and its derivatives which is pure carbs. When you take a lot of Kambo through out your life you need larger amounts to purge. Eight large points might not do it. I too think that you can vomit emotions as well as toxins that Kambo releases from the body's cells. If you don't purge, some toxins will be released through the bowels and some will be reabsorbed by the intestines.
I think its true to say that tribes like the Matses who have lower levers of contact with the outside world probably carry fewer toxins. Toxins can come from the environment, water, recreational drugs, prescription meds, pesticides, insecticides, toiletries, vaccinations and lots more as well as food. Those who live in this kind of world will be constantly taking toxins into their bodies, those who don't will obviously be cleaner.
I've taken Kambo over 100 times now and I still purge. Mostly clear water and then bile. I don't purge with Aya because my brain is used to it after so many years but I still purge with cacti. Gotta love a good purge!