1) You cannot die from an overdose of LSD
2) The article doesn't give examples of anyone dying, though it does give examples of self-injury and panic attacks.
3) This all sounds like BS
4) LSD is derived from ergot, a natural mold which can affect bread and which has been known to cause hallucinations for centuries, long before the CIA was around.
I’d quibble with point 1) if someone had perceptual distortions leading to an accidental death or suicide.