I couldn't find a cited source in the video you linked, but is this backed up by anything more solid? I've spent a lot of time researching biosynthetic pathways as they pertain to monoaminergic systems and I have not found anything that would get even close to a partial ergoline, let alone LSA. Anything is possible I suppose, but I imagine that it would be more likely that we'd end up with methyl groups on peculiar positions of tryptamines, Even something like a beta-carboline would be more likely I would assume (people already suspect pinoline may be present in the human brain, though I've yet to find good evidence of it).
