I wouldn't want to say there's no correlation without controlling for, well, a lot.
This looked at breast and colon cancer, which could be drowned out by noise from other cancers if this doesn't apply to them, for one. Other sources of cancer like diet, smoking, and being constantly irradiated would vary on a national level.
Also, the post seems focused on cancer becoming metastatic, which wouldn't be the same as cancer incidence, and looking at cancer deaths isn't helpful either because of variations in treatment, etc.
This looked at breast and colon cancer, which could be drowned out by noise from other cancers if this doesn't apply to them, for one. Other sources of cancer like diet, smoking, and being constantly irradiated would vary on a national level.
Also, the post seems focused on cancer becoming metastatic, which wouldn't be the same as cancer incidence, and looking at cancer deaths isn't helpful either because of variations in treatment, etc.