It's not whataboutism at its best, no. Just as with self-driving cars, medical AIs don't have to be perfect, or even to cause zero deaths. They just have to improve the current situation.
Yes a patient could be at risk - they're at risk from everything, including a poorly trained/outdated doctor. And even more at risk from just not having access to a doctor. That's the point: it's a risk on both sides; weighing competing risks is not whataboutism.