Anyone got a better source for or against the claim the article makes that nearly half of all human deaths over the last 50,000 years were caused by malaria? It

Anyone got a better source for or against the claim the article makes that nearly half of all human deaths over the last 50,000 years were caused by malaria? It seems suspiciously high, and at a quick glance the Nature paper linked doesn’t seem to have any justification for the claim.