For one, the article doesn't suggest that this will indeed be allowed as a part of that process. OTOH: it's easy for a flight ticket pass (which has time and airport location) but not for a gym membership pass (time can be anything and the gym can have several locations.)

Location-based functionality like this is already widespread in iOS; I'd be surprised if it wasn't supported. Reminders and calendar events (and PassKit!) already have it, for example.