That has nothing to do with how they have already reduced costs, and how they continue to do so. Before SpaceX, you launched a rocket to space once, and then you discarded it. Imagine how much a plane ticket would cost if each time a plane was flown once, it was then discarded.

The big revolution with SpaceX was meaningful reuse (I can get into the comparison with Space Shuttle if you're unfamiliar there). Landing and reusing rockets is something that Boeing et al thought was impossible from an economic point of view, and actually taunted SpaceX in their early years over it along the lines of 'Oh you're going for reuse. Yeah we researched and trialed that out a decade ago. The economics don't work. Cute to see you trying though.'

Their success there is what helped bring the costs way down. But there's still plenty that's not reused - in particular they currently only reuse the first stage (the big rocket that gets things off the ground initially) while discarding the second stage - the space-optimized payload delivery rocket. With Starship they're going for 100% rapid reuse. So you're looking at this absolutely massive 2 stage system where both parts will be able to be repeatedly and rapidly reused.