I don’t agree at all the the quanity of oil (in this case a small amount overfill) will increase oil pressure. Now if we are talking about crankcase pressure this would take a double shot of oil to do that.We would see high crankcase pressure due to the quanity but low gallery pressure due too “foaming” of the oil. Overfill "a little’ underfill "a little’ no harm what so ever.
Now we certainly can reach a point (different with each engine and operating parameters) where overfills and underfills will cause harm in equally destructive but different ways.