@BOOKidealist Good question. The policy requires that the
#OpenAccess version be in
#PubMedCentral <
https://pmc.ncbi.nlm.nih.gov/>, not necessarily in the journal. But I just searched PMC for this article and it wasn't there. You're right that something is amiss.

PubMed Central (PMC)
PMC is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).
PubMed Central (PMC)