I'd wager yes. Because when the rescue team goes in they'll count bodies, living or dead. Doesn't matter if the person died before the plane landed, in a fire that erupted after it landed or made it out alive.
Airplanes do sometimes transport human remains in caskets and do not contribute to the count of souls on board. FAA Advisory Circular 150/5210-7D (Aircraft Rescue and Fire Fighting Communications)[0], for example, defines souls on board as “total number of passengers and crew.”
If the pilot says "50 souls on board", but is also transporting 2 cadavers, and the rescue team finds 50 bodies before giving up, it's possible there'd still be 2 people alive when they gave up.
You want all of that to add up to some total.