So now if criminals found only in widely available public sources begin dying of heart disease and cancer at correctly distributed but far-above-average rates,

So now if criminals found only in widely available public sources begin dying of heart disease and cancer at correctly distributed but far-above-average rates, L will know that it's somebody who read this article - possibly Gwern himself! Even if this article hadn't been published, such clever use of the Death Note would certainly point to someone with high IQ and possibly involved in the cryptographic community...