They need to prove it. Talk is cheap and corporate PR is not very reliable source of information.

SpaceX has been known to talk bullshit ... or more charitably, they have been known to mix aspirational language into their projections. Case in point, I saw a TED talk with the SpaceX CEO claiming that rocket-based passenger travel is just around the corner and will be faster and more efficient than airplane travel... a claim that on face value is just stupid, bordering on insane.