I've been waiting for your other shoe to drop by way of explaining to others why it's wrong. If so, please say why. We fly 800s with the package and I can't find anything in the FCTM, the FCOM or the QRH performance section except data on the pitch-roll angles at which various extremities of the airframe are at risk or not depending upon whether an SFP package is installed.
The only information I am able to find online is from non-Boeing sites which in itself points to another issue regarding getting information for operators from Boeing, but I'll leave that aside.
Here is what B737.org has to say, as linked to previously:
I’m confused. Are you saying the short field package does not affect landing performance/distance, and then you post information that shows it does exactly that?
I fly both versions, and I don’t need a book to tell me this package reduces landing distance. I can feel it. We fly these versions into airports with short runways, and it makes a big difference.
The challenge is you only get full leading edges when flaps extends beyond 25. That makes tailwind approaches a challenge, more so if the GS angle is more than 3 degrees. Early speed reduction and the use of landing gear to slow down is common.