Ah, that's what I was remembering then!It was definitely PV. See this and the immediately preceding post:
I don't remember Mix happening that way. I think NYCFC announced when they used their annual waiver to buy out Mix's contract. Later I believe Man City announced when they bought the contract from MLS. But I don't think Man City announced that NYCFC waived Mix.
ETA: Actually it was Umbro who announced Mix signing with MCFC: