Oppression does not exist in a vacuum. It exists to serve the demarcation between the superior and the inferior, no matter how faulty such a demarcation is. And the demarcation there was a piece of clothing, a veil.
Who really was Amos Tutuola? An amazing but naïve primitivist? An ethnographic curiosity? A quasi-plagiarist of the fantastical creations of D.O. Fagunwa? The most likely answer: he was all of these but also more.