I think it all depends on how they handle all those little triangular plazas. This looks reasonable, but will it really function like that?
I do think it is worth acknowledging that the topography of the site is in fact quite challenging, and a normal street grid approach might well fail to become a walkable neighborhood--and it certainly would be tough to make it elder- and disabled-friendly. But of course it is the introduction of those more walkable diagonals layered on top of the previously-planned street grid that create all those little triangles:
Maybe it would be better without the underlying grid streets, but it is too late for that, and it would probably be a tough sell anyway.
Moreover, I suspect the creation of the new diagonal corridor to Freedom Corner, plus beefing up the side of the buildings facing Centre, may be an attempt to compensate somewhat for the loss of Wylie as a "main street":
That doesn't mean it is as good as can be. I still have reservations about the whole lower portion, and I'd actually like to see them fill in both sides of the lower zig-zag portion of the central path a bit more, rather than leave so much open space.