drugabuse.gov should probably not be considered an un-biased source on the topic of drugs of abuse. Some of their material will be propaganda and FUD.
75% of the authors are affiliated with other institutions, only 3 are with the National Institute on Drug Abuse.
NIDA itself is well-grounded. There have been some instances where they take a more conservative stance given uncertainty in results, but this is still a national scientific institute - not DARE or the DoJ.
Finally, the paper is on PMC: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426185/ - why do you disagree with their conclusion?
I am involved in a number of communities that engage intentionally, even sacramentally, with psychedelics. The amount of sheer bullshit they continue to promulgate on that matter, about which I consider myself advanced-lay to burgeoning-expert, is staggering, and is sufficient for me to be default skeptical of anything else they might have to say. When you lie to me about things I know something about, I'm obligated to trust the rest of your oeuvre somewhat less, aren't I?
Finally, I said nothing whatsoever about the conclusion of the paper under general discussion. In point of fact, I generally agree with it.
It's just disappointing when that happens, because I try to engage that way, and assume my comments will be treated the same.
EDIT: That said, I didn't exactly offer much in the way of argument there, did I?