Elevated levels of LPS are observed in autism, Alzheimer's disease, amyotrophic lateral sclerosis (ALS), and major depressive disorder.
"So we see elevated LPS in autism, in Alzheimer's, in amyotrophic lateral sclerosis, and, as I mentioned, in major depressive disorder." (said at 0:33:28)
No published record matching the claim that elevated levels of lipopolysaccharide (LPS) are observed across autism, Alzheimer's disease, amyotrophic lateral sclerosis, and major depressive disorder was located; this does not prove the claim false.