The reduction is in the rideshares. Due to their launch rate and low internal costs, SpaceX is able to offer a fixed schedule launch capability for small payloa

The reduction is in the rideshares. Due to their launch rate and low internal costs, SpaceX is able to offer a fixed schedule launch capability for small payloads to popular orbits. These small payloads individually have to pay much less than what they would've had to pay in the past, and get a guaranteed ride to space without fussing over the primary mission's needs. As a result SpaceX have eaten up most of the small launch market (eg no messes like having the batteries die on the pad because the only way to get an affordable ride is to fly on the maiden launch of SLS and Boeing isn't flexible enough to be able to charge them) They even have a price calculator and scheduling information on their site for these.