Not odd at all. Umbran said nobody tracks deaths in D&D games, I merely pointed out that for my own part, I do.
And if enough people in Europe share their salary numbers and someone aggregates that info then you've got something to work with. It might not be "scientific" for peer-review purposes but so what - it's still a whole lot better than nothing.
Same as if enough people share what happens in their own games and someone aggregates that info, then you've got something bigger than just a single game's data. And in this specific instance you'll never get "scientific level" data anyway as everyone's game is different in terms of lethality, what can or cannot kill characters, and so forth.