> If they found a link, they found a link

You could have skipped the wall of text. They didn’t find a link. They found a random correlation.

The scientists here essentially engaged in P-hacking: https://en.wikipedia.org/wiki/Data_dredging

Munroe didn’t misunderstand the independence of the experiments at all. He understands that misleading spurious results can arise from repeated experiments.

> And it needs further research. Not less, not more.

No it doesn’t. At least not anymore than the other colors. A positive result is no more deserving of further investigation than a negative result. What you are describing is bad science.