I would agree with his assessment of Bufo Alvarius at the moment. I know other popular figures associated with 5-MeO-DMT have been drawling links between the Maya and other groups, and Bufo Alvarius. Andrew Weil and Wade Davis also put forth the hypothesis that the toad of the Maya is more likely to be Bufo Alvarius, rather than Bufo Marinus. The basis for this conclusion seems to be centered around the idea(perhaps more enforced at the time) that Bufo Marinus venom is toxic, and that it's predominant tryptamine, bufotenine is not an active visionary tryptamine. This however, is conjecture and it has been shown that at least bufotenine itself is highly visionary.
Bufo Marinus is local to the region, while Bufo Alvarius would require long distances traveled to collect the venom, or trade...which is not at all hard to imagine. The fact that there is an indigenous bufotenine producing toad, however, should be cause for more investigation of the theory that the Mayan toad was Bufo Marinus, and not Alvarius.
I find it misleading that people are going around claiming this toad(Alvarius) is necessarily linked to Mayan culture.
Long live the unwoke.