Is this a plothole? Question about the Endless

[SongOfTheWind]

I refuse to believe a Sharlayan scholar simply forgot how the afterlife works in regards to his mother

I am a bit confused. Erenville is not a scholar. He is a gleaner, knows a lot about nature/animals, that jazz. How does it make him a specialist in Aetherial things? I think he is quite obviously just mistaken.