Possibly.It's not that, but I bet it's a precursor to a PAC-CW deal. The PAC probably didn't take CW's offer seriously. Now they might try to come back to the table as a "real sports channel"
But my guess is the CW got those ACC games on the cheap since they were tier 3.
I would think the Pac12 wants their linear partner to be tier 1/tier2 at a hefty pricetag.