It is an article from the bmj “Christmas issue”[0] which is meant to be light hearted or satirical. My personal favorite was about the efficacy of parachutes when jumping out of a plane[1] - which fails to clearly describe that the plane was on the ground. Their point was about replication and clear thorough explanation of methodology in science.

The Christmas issue has been critiqued for exactly the reason you made this comment - indexers don’t pickup on the differences of the Christmas edition making it functionally invisible if you see it in pumped unless you know about it

[0] https://www.bmj.com/about-bmj/resources-authors/article-type...

[1] https://scholar.google.com/scholar?hl=en&as_sdt=0%2C11&q=bmj...