Yes, that is exactly what it means, but the numbers may not be compatible.
You have to keep in mind:
1) that the population of the world has increased since the two World Wars (population inflation) and that reporting nowadays given computer technology is more accurate in recording data.
2) "preventable deaths" covers the entire world, where as the deaths in the World Wars primarily covered military deaths and possibly some civilian deaths where the conflicts were less geographically spread out.
3) there would have been some (naturally) "preventable deaths" which occurred during the World Wars, but may not have been recorded or at least included in the war casualty figures.