I had a similar thought, something like varying levels of ambient humidity closer to the washroom. The experiment needs to be repeated in more controlled conditions. Surprised to see the HN crowd taking this obvious pseudoscience at face value.
Pseudoscience is generally when you have an explanation for something but no evidence, and generalize that theory to explain too much
So we can call it light science. Or amateur science?
People shouldn't be discouraged from practicing science.
I'm not discouraging anyone; in fact, I'm encouraging repeating the experiment with more rigour, that is calling for more science.