I first read about it when I found out that they were planning on paving the Van Cortlandt section, it was always the big picture to extend down.
But I'm confused in the PDF you posted the proposal part of the picture say it would Intersects with the Harlem River Greenway.
The Harlem River Greenway is on the other side of the river and starts at the Intersection of Dyckmen St & 10th Ave where the Harlem River Drive starts.
Or am I missing something?