The paper you linked does not say what you claim it says.

Instead, it appears to investigate psychoactive drug deaths not to do with overdose.

There appear to be no "traditional" psychedelics (serotonergic hallucinogens like LSD, psilocybin, etc) covered here _at all_ except perhaps one death categorized as a "hallucinogen", which is definitely a lot less than 100% of the 147 deaths investigated.