Oh, we are to get an order of magnitude of cost reduction per kg on an orbit. There are attempts to measure it: https://everydayastronaut.com/raptor-engine/
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.
Most people will remember the achievements and not the bold claims.