It's not a scientific theory, at best it's folk wisdom. This article is pointing out that there is no scientific basis for it.
The onus is not on anyone to disprove the theory, the onus is on the theory's proponents to prove it, they haven't done so, not to the slightest degree.
The onus is not on anyone to disprove the theory, the onus is on the theory's proponents to prove it, they haven't done so, not to the slightest degree.