(note: I am the Director of Data Science at System)
We love wrestling with these types of questions at System. The examples that you gave are "semantic" on System. You find those connections in Wikidata for example. (Q19546 -> Q9592 -> Q1841 or Q1297 -> Q1204). A relationship is statistical (as defined on System) if you can estimate its strength statistically, in a population and with certain statistical confidence.
We love wrestling with these types of questions at System. The examples that you gave are "semantic" on System. You find those connections in Wikidata for example. (Q19546 -> Q9592 -> Q1841 or Q1297 -> Q1204). A relationship is statistical (as defined on System) if you can estimate its strength statistically, in a population and with certain statistical confidence.