unreliable? in Vineland

[Terrance]

> >
> > on page 3 mid-paragraph 1 the narrator tells us what Zoyd understood.
> >
> > how does the narrator know this?
> >
> 
> Because P. chose an omniscient narrator for _Vineland_, a God-like
> perspective that allows insights into the depths of the characters souls and
> minds. And he's consistent in this throughout the novel.

I don't think that's what we've got in VL. Again,  focusing on POV tells
us very little. 
The Lodge on James & POV quote deals with POV. Tim is talking about POV.
But what allows the narrator to get inside the dreams, the thoughts, the
heads and hearts of  the characters in VL is "privilege." Observers and
narator-agents, whether self-conscious or not, reliable or not,
commenting or silent, isolated or supported, can be either privileged to
know what could not be known by strictly natural means of limited to
realistic vision and inference. Complete "privilege" is what we usually
call "omniscient."  But we should not mix these up because there are
many kinds of privilege. 

Is privilege limited in VL or is it total? 
Very few privileged narrators are of the type that you describe--total
or the god-like omniscient narrator allowed to know or shown as much as
their authors know.