I'm not sure when the study was done, but that article was first (c) 2000. I have never had a doctor or nurse mention running a fan, and neither my wife or I have come across that when researching care of our children... but a 72% decrease in fatality is pretty damn close to an outright cure. How is this not broadcast loudly to every parent of a newborn?
"Only 6 of the 167 coroner-pronounced SIDS cases used fans, while only 36 of 309 controls used fans."
and
"The case and control groups were not similar at the beginning of the study."
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That paper is from 2012, but I can’t find a newer paper that changes that. For example https://pubmed.ncbi.nlm.nih.gov/27940805/, from 2016, doesn’t mention fans in its abstract.
Having a child is an extremely frustrating experience from this point of view.