I disagree, at least partially. The wall was meant to be there all along, sure, but the second tower will be built right up to it. You can see several openings that were built, then covered with cinder block filler. There are five levels (four of which are visible) of these along the far left side of this shot (there is also one larger one just to the right of center, near ground level):
It seems clear that they were going to build the second tower then knock these cinder block areas out, opening the tower to the common areas in the townhouse building. But until then, covering them makes sense, so current residents can enjoy those common spaces without being exposed to the second tower's construction.
But here's the thing: if they were going to build the second tower anytime soon, certainly within the timeframe of that old quote, why would they bother painting over this wall? It will have a tower connected to it and never be seen. Further, they could have painted over it long ago, but didn't until just a few weeks ago. It sat for months uncovered and unpainted.
Personally, I don't think they ever planned to paint it like this. They were going to leave it a concrete wall and build the second tower against it. But then I think they realized the housing market was tanking and decided to put off adding even more units to a development that is already having trouble selling what they have. That's when they decided to paint this to match the mechanical venting on the far left side, so it won't look so bad while it sits waiting for the market to come back around so they can build the second tower.
Just my opinion, of course, but I just can't see why they'd bother painting this wall that will never see the light of day once the second tower is built unless they expect it will be visible for much longer than originally planned. Like I said, I still expect it will get built. But I think it's going to be a long wait.