Data from Postauto AG (PAG) is available for some of the lines/stops, but not for all of them. PAG data is not delivered centrally from one PAG platform, but through various platforms, depending on the PAG region (not all of these platforms are delivering yet). More PAG lines/stops are still being added, in a couple of years the list should be complete.
The PAG data in this data set doesn't necessarily align with the data on haltestelle.postauto.ch (not the same lines/stops are available).
There is probably no data source containing real-time data for all PAG stops.