He is not free from viparinama dukkhā and sankhara dukkhā and dukkhā dukkhā.
Noone except Arhant is free from that dukkhā.
And Nibbanā is even higher release than assana realm existence.
Buddha himself said that even highest jhanic pleasure of this world is not worth 1/16 of nibbanā.
So, NO WAY,
Experience of assana = nibbanā.