Just to add to the story of disappointing deaths with this species, I had a pair of nothofagus antarctica 'Puget Pillar' that were each growing quite nicely until about August last year when they behaved like it was fall - leaves yellowed and dropped seemingly just like it was Nov when leaf drop normally happened.
Both were clearly dead this spring (would have been their 4th with me). The only thing I can identify to have been unusual last year (as opposed to the previous two) was that both sat in close proximity to a photinia that perpetually suffers from (presumed) Diplocarpon leaf spot. The nothofagus leaves did first turn yellow, then brown, in the centers or nearest to the petioles, but otherwise didn't exhibit any obvious 'spotting' patterns.
In retrospect, it is a pity that I didn't keep the two separated in different areas of my garden.
Meanwhile I do still have a specimen of a smaller, prostrate variety of nothofagus antarctica that continues to do well (5th year now, IIRC).