The article isn't describing anything related to knowledge unless they mean that as a euphemism for knowledge of the unwritten social signals for how to to adve

The article isn't describing anything related to knowledge unless they mean that as a euphemism for knowledge of the unwritten social signals for how to to advertise your class (which isn't even the main thing). This is talking about cultural capital. Like financial capital, families can accumulate it over several generations. Particularly for CEO-style jobs which are relatively close to modern aristocrats - there isn't any special knowledge floating around generationally. CEO skills aren't even hereditary. Being recognised as being in the pool of people who are expected to be CEOs is though.