I am speculating, but I am pretty sure the bikeshare vendor assumed most PTC travelers would be arriving/departing by some form of automobile because of baggage burdens. If we know of a sizable cohort of daily commuters with only backpacks to carry that would use PTC bike share options, we should find those people and get them to speak up. Otherwise, I think it is reasonable for it to be left out of the Phase One start-up.
Also, Thompson's Point service would scare me as a vendor since it is very feast and famine. On concert days most of the system's bikes might end up over there, depriving other users and putting a big burden on the system (that still might happen whether or not there is an official location there).
The children's museum and food scene over there may provide more regular traffic but I can't imagine the vendor has not knocked on their doors and had discussions. Ideally those places SHOULD be asking their visitors this season whether a bikeshare option would be useful to them as a way to gauge further investment there. There is also a conflict too with the operator of Thompson's Point - they get less parking revenue every time someone rides a bike there! I am sure parking revenue is a good portion of Thompson's Point cash flow right now since its build-out remains a plodding affair.