This is the immunology equivalent of "jet fuel can't melt steel beams". It's embarrassing to see it here, especially in a community with pretensions of bringing "disruption" to biotech. It would take a long time to catalog all the nonsense here but I'll just say that short subsequence (6aa) BLAST is meaningless and this subsequent claim is just word salad: "Such high human similarity also implies a high risk for the development of severe adverse events/toxicity and even Antibody Dependent Enhancement (ADE)"

(there's no relationship between the capacity for ADE and self-similarity of amino acid content)