I think when you couple no glideslope, poor visibility, a relatively short runway, visual illusion with downsloping runway, snow etc on runway you have a strong possibility of a long landing.
I don't know anyone who hasn't been taught...if you don't touchown in the first third, go around.
my guess is:
we will find out that runway touchdown was with 3000 feet remaining or so.
the real tragedy is how badly delta treated the passengers who trusted their lives to the odd mix of delta and their contracted emb carrier.