Okay, I looked at this source. It's accrediting every death that resulted from Spanish colonialism in the New World directly to Columbus. It's also not really a historical article, rather a critique of the continued celebration of Columbus Day. I mean, that Columbus started the genocides in the colonial Spanish Americas, and was responsible for implementing the basis forsome of the systems that would become entrenched in the colonial mentality (ie: encomienda, tribute) is valid, but personally attributing every death to him is a bit much.

Seven and a half million human beings were subjected to murder, torture, oppression slavery, and cultural dislocation, all of which exacerbated the continual onslaught of the diseases brought with the european invaders. Seven and a half million human beings were the collateral damage of the economic expansion of the castilian empire. Seven and a half million human beings were the price paid for the colonial expansion into the newly "discovered" hemisphere.