you said that already. The equivalent of “SOME may die” is that most will live. Those are logical equivelents.
If I say Some cows are brown. That means other cows are not brown. right?
No, as, some, not most are brown, so
some NOT most MIGHT survive.
As for” how it is possible for fewer people to be hospitalized but the same number of people die.”:
The stage when clots form in the lungs was not prevented for various reasons, so naturally, the medication had no beneficial effect.