Yes. See my post above. I don’t understand why this is a difficult concept to grasp. I would think everyone understood this from personal experiences or those close to them.
There are very few wonder drugs that work 100% of the time.
Even if it is 99.9% effective, in a condition affecting a thousand people, that is one person who dies.
It is just how it is.
Even the COVID wonder drug Remdesivir does not have a high efficacy.