I don't think you did anything wrong, since I was just following the prefect route guide and didn't see and sea salt ice cream to select there either. I guess the main question now is whether its a bug or if they removed it for one reason or another
Sea salt ice-cream option was removed when Dzahn took control of the project. Considering the connection to Kingdom Hearts is quite heavy, he decided it would be better to not have it in there for now. We’re discussing how to proceed going forward.
I am a little disappointed with that decision but it's not my call to make and it does not effect all the great work everyone has placed into this. I do miss that extra point.