Will GO continue to use that platform after GO RER is complete? Looking at the current schedule, it doesn't look like they are using it now (the track at that platform is currently disconnected from the Kingston sub at the east end and none of the trains end at Pickering, thought that might be COVID).
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Even if GO does plan to use that platform, I only suggested that some of the trains could stop there. If there was a scheduled conflict with GO, VIA could skip the station.
While I am not convinced that it is a good idea for VIA to do this, it is a better option than having an HFR Pickering station on the Havelock Sub.