VADR is an IDIQ for which up to $1B is authorized to be spent on up to 16 launch providers and brokers. The SpaceX FFP task order is just for one launch for Starburst.
Based on Space Force having just bought 18 Falcon 9 launches for $1.6B, this order is probably only $100M. The other $900M is still up for grabs by any of SpaceX, ULA, Relativity, RocketLab, Blue Origin, Firefly, NGC, and some others I’m not familiar with.