SpaceXSI's short term IaaS contracting terms means it can take advantage of the premium that new chips can command given their superior tokenomics.
Whereas traditional neocloud players will sign medium term deals on their facilities in order to secure financing, SpaceXSI has more balance sheet leeway (and also wants to maintain the option to call on the compute for internal purposes). This means their realized IaaS pricing can remain almost double other neocloud's so long as they continue to scale their compute assets.
Net SpaceXSI could realize IaaS pricing in $30 to $40b per GW range even as other players have to settle for inching over $20b per GW.