what do they consider "preventable" deaths?
I've seen other studies that show that the US has much higher survival rates for cancers and other often-fatal diseases than any of the countries that have nationalized health care. Does WHO consider those deaths "non-preventable" because other countries don't have (or offer) effective treatments?
Do they consider death-by-gunshot "preventable" deaths because we don't have the gun control laws they advocate? Fairly recently WHO still counted gun-related deaths in the US as epidemic-related.
High-level statistics like these are meaningless unless you know how terms are defined and how the data was gathered. WHO will also tell you how low we rank in life expectancy without noting that there are wide disparities in how infant mortality is measured from country to country. Some countries count children who die within their first year as never having been born and WHO simply accepts those differences and reports them as if the numbers were counted the same way across the board.