I am no fan of Elon Musk. But, moon landing conspiracy theorists taking his comments about starship out of context and saying he just proved the moon landing is fake are really extraordinary. And ridiculously stupid.
The actual context is that musk sees that to get to the moon with starship, the craft will have to refuel in space. This was always part of the plan for starship (though of course the goal was and is to get to mars).
While it is the most powerful spacecraft man has ever made, it is also very heavy and very large. This is intentional to carry large payloads to a high orbit.
In order to achieve orbit, it uses its 33 rockets and burns all of the fuel it can carry. To get out of earths orbit would take more fuel, and therefore a refueling is required. How much refueling (and how many times in orbit it would need to dock up) would depend on the mission. His estimate to get to the moon would be 4 refueling stops, as I understand it; that would allow that spacecraft to land on the moon and have enough fuel to return to earth.
There is a significant amount of science and math that goes into the calculations, much as there was for Apollo.
Apollo was purpose built to launch, get out of earths atmosphere, then have a burn that sent it toward the moon, a burn to get "lunar insertion," and a burn to get home. There was some fuel expenditure to do adjustments, but that was mostly planned. It carried enough fuel for this purpose - and remember that the capsule did not land on the moon, only the lander did, and carried enough fuel for the weight of the craft in order to descend and launch again.
The math here was on paper, and done to the point of precision, using momentum and gravity pulls to their advantage. And remember that on Apollo 13, the fuel situation was such that a simple return to earth once they encountered the problem was not possible. They had to continue to the moon and around it, in order to return to earth. That's how precise the calculations were.
Anyway, the moon landing hoax idiots are taking what musk said out of context. Essentially "If he says it would take refueling, then he is also saying that the Apollo moon landings could not have happened."
That's really drawing with a broad brush and not understanding the math and science. And not caring about it because they simply have to be right.
That's not what he said, at all. Though to be fair, he hasn't really disputed it either (he does like to stir the pot). But why let facts, the hard work of men (and women!) who got us to the moon, or science get in the way of a good story?!