Whenever I see a paper from this long ago, I immediately check to see how often it's been referenced in the literature. Google Scholar says this study has been cited by a measly 16 papers since it was published in 1973: https://scholar.google.com/scholar?cites=1453678737796934715... Without any other context, I would assume that the relative lack of studies that reference this paper suggests that there might be issue…
"There have been many experiments running rats through all kinds of mazes, and so on--with little clear result. But in 1937 a man named Young did a very interesting one. He had a long corridor with doors all along one side where the rats came in, and doors along the other side where the food was. He wanted to see if he could train the rats to go in at the third door down from wherever he started them off. No. The rat…
https://en.m.wikipedia.org/wiki/Gregor_Mendel
Mendel’s work was not appreciated for 30 years. Ignoring ignored works is following the herd.