That’s a bit of a stretch and you know it but I’ll just humor your argument for the sake of discussion.
We both know that the “story” or “lore” more accurately of DotA/LoL was just added later on bit by bit. DotA for one even was just a map/mod back in the days. It doesn’t have a flashed out story at all, let alone a story you could experience/play. You can read up online about it but we also both know that just a miniscule fraction of the playerbase actually did do so.
LoL even rewrote all of it’s characters background once and just ditched the previous “story”.
Now granted LoL is rectifying this now with books, more flashed out character description, spin off games and the Netflix series but it most definitely didn’t start out like that.
We also both know that literally nobody started playing DotA because of a story. It’s just a competitive multiplayer game with basically no story to experience. All you could do was to read “flavor texts” but that’s about it.
I’ll also just assume that you actually found source of DotA2, which was released decades after the original DotA which wasn’t even a singular thing as there were many iterations of the DotA mods such as DotA Allstars.
Getting back to your initial point though. What you’ve quoted are the character descriptions of (of the very first character to be found on the Dota2 page) is what one would call “lore”.
There’s a difference between “story” and “lore”, even if the word story is found within flavor texts.
A story is a sequence of events that can be experienced/played. A Plot or a narrative so to say.
Unconnected character descriptions that are in the game can be part of a story but are not a story by themselves, they’re just lore at that point.
There factually is no plot/narrative of DotA in the game. There is no story to experience. There is no plot to play through. It’s just a 5v5 battle arena without any meaning to it.
If you find a story mode in DotA, let me know though.
Not to say that stories about DotA that connect the lore don’t exist outside of the game because they now do, but they didn’t use to exist when the game launched and are still not in the game itself.