Nirvana in what is to me “contemporary” use, is referencing a generic state of bliss... not necessarily spiritual. At least it was decades ago when it was being used as a hip way of stating that one is residing in a happy place.
You are dead on about salvation.
I do get it of course... just being rhetorical for rhetoric’s sake. Wouldn’t it be an oxymoron anyhow to desire nirvana?