Earlier quoted context omitted.
You can't compare falcon to SLS because Falcon cannot do what SLS does. You can't compare SpaceX's figures to NASA because NASA has many, many more reporting obligations than SpaceX. Every report on Falcon 9 costs has made this mistake forever. SpaceX does not release their full costs. What numbers we have for them are PR releases. Meanwhile, NASA's budgets are public and comprehensive, and they have legal parameters…
Of course the Falcon can be compared to the SLS. Both are vehicles designed to take things into space for crying out loud! The figures are easy to compare as well. Just include these factors in your comparison! Even if we don't know exactly what those factors are, we can make a ballpark estimate the total difference and add that as a percentage to spaceX's final figure. The idea that things can't be compared because…
They have quite different fairing capacities, in a playfield that does not scale linearly.
It is like saying that the Boeing 737 is cheaper than the 777, and we can compare them because they were both designed to fly people in the sky.