That’s correct to an extent I think. But it’s still perfectly possible one who achieves a deep enough attainment would realize the true meaning of non self even if they didn’t have it at the pariyatti level. The Buddha didn’t even mention anatta in the dhammacakkavappattana sutta yet the 5 brahmins could make it to sotapanna just hearing that. And only needed to hear the anattalakkana sutta to go further than sotapanna.