That's an exaggeration. Boly is a fine CB, doing a proper job in the Premier. Felipe and Niakhaté were your best CBs last season, Worrall is your captain, McKenna may not be of a Premier standard but always gives everything he has, Omobamidele is one for the future.Other than Murillo, they all have issues - age, propensity for injury, lack of pace, likely to drop a clanger or just not good enough.
I would gladly get Felipe off your hands in a heartbeat. He is precisely what we need in the moment (we have three young, dynamic but relatively inexperienced and prone to error CBs, who need quality and experience next to them).