Hello! As said the phrase has to be written with 0 mistakes, bad spelling, forgetting a word, putting not in the right order... so on so forth = disqualification.
If the phrase is: "No one has ever done that in the history of dota." This is the only right answer possible you have.
"No one has evre done that in the history of dota." isn't correct
"No one has done that in the history of dota" isn't correct either.
I think he meant that if YOU make a spelling mistake in the word(like his example) should we use the same spelling you used? Or use the correct spelling
Oh, haven't figured it out, the sentence will have no spelling issue I checked it don't worry :)