Indeed, looking from a transit planning perspective it is an obvious missing link to have the line stop short of the Timmins bus terminal located on the site of the former train station. However, the train is only expected to run once a day so it doesn't really matter if the line connects to the regular all-day bus services. All that matters is that there are buses at the train station when the train departs and arrives. Which only requires two special bus trips per day on each route.
For one train per day, it would be impossible to justify extending the line west to the old station, but they could at least build the train station at the west end of the remaining rail line (4 km from the centre of Timmins) rather than at Porcupine 13 km from the centre. Or maybe they could have stops in both locations, with just a basic platform and shelter in Porcupine.
Existing railway in blue.
View attachment 447205
The longer people can stay on the train, the less early they need to wake up in the morning. The current proposed timetable has the northbound train arriving in Porcupine at 05:10.