Space X cares way more about reusability than the moon, they're not actually in a race to the moon. Step 1: build the best general solution. Step 2: do everything
However what people say and their real reasons aren't always the same.
I assume Issacman went around to everyone and convinced them to say they're all switching on the moon, add another test flight to delay things, and in return they'll switch to using Starship in the future as they will cancel Block 1B of Artemis