Was it though? Because this project certainly doesn't read that way to me.
For a long time - well before the REM became known in the public consciousness - there has been a want to properly connect the two Dorval Stations. There have been very small improvements made over the years, but if one wanted to walk from the north side of the EXO station to the VIA station, it's still a half-kilometer walk today.
This project strikes me as the first steps towards making that happen. (I suppose a fair question would be whether this would better serve VIA or EXO, and thus who should be leading or paying for it.)
Dan