Heinrich Arentz, Prinz - Who is his real parents?

His alleged father, viz. the archbishop Heinrich etc. was childless according to Neue Deutsche Biographie. Also note that Arentz is a patronymic, the son of Arent or Arend, Cf, German Jürgens or Irgens, the son of Jürgen (George).So the the stated relation is likely just another example of the millions of fake ancestral relations that flourish on Geni. Why do people fabricate such nonsense which amounts to nothing but blatant lies?