Everything he could have achieved is viable because he never said anything concrete. He controls where the moving goal post would be set.
That is very important, especially with the changes in design and architecture that the rocket has seen so far.
Given the way SpaceX is known to develop and iterate, I am willing to bet that before - or if - this thing actually materializes as the Artemis lander and/or a viable commercial payload LV (seems to be
a goal, at least), the goalposts will have moved....a lot!
In this context, arguing about capability and viability is...an exercise in futility since they control the narrative in what each
should be at any given time.
Can't really set a firm point in moving sand, after all.