In a sense, samsara and nirvāna both appear for the practitioner, but not for the primordial state.
There is no delusion in your nature, delusion and the exhaustion of delusion both occur secondarily, “on top” of the nature, as Malcolm once shared Khenpo Ngachung saying.
In Dzogchen we aren’t refining our nature, the primordial state, which is already always originally pure and naturally perfected. Instead we are refining and working with our knowledge [rig pa] of our nature. Samsara and nirvāna both occur within this scope of refining our rig pa, purifying obscurations, etc.