I think such experiential truths should not be intellectualised. Any intellectual stance - of permanence or impermanence will be outside of non-dual reality.
Silence is the right answer. cf. Vimalakirti sutra (Wikipedia).
Vimalakīrti remains silent while discussing the subject of emptiness
with an assembly of bodhisattvas. The bodhisattvas give a variety of
answers on the question what non-duality is. Manjusri is the last
bodhisattva to answer, and says that "by giving an explanation they
have already fallen into dualism". Vimalakirti, in his turn, answers
p.s. I didn't downvote, I don't object to the question.