It's important that you get behind the headlines and seek out the facts. Most modern production boats have instances where keels have departed, however typically they are subsequent to groundings and/or inadequate repairs and tend to involve the performance/racing versions which suffer higher stressors/loads repeatedly. Having said that my understanding is that yes, one of the Bavaria Match Series (racing version) had a questionable high aspect performance keel design (long keel with reduced bonding surface to hull) which Bavaria did have to address. I would be more concerned about who owned the boat and its history than the model as a predictor of keel integrity in most instances. Suffice to say a professional survey is essential in any purchase of a pre-owned yacht.