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In article he mentioned 1242px by 2208px with 462ppi as 3x of 163ppi (original iPhone). Shouldn't it be 489ppi ?

Really confusing.

Yep, another error. He also wrote 412px instead of 414px in some other location.

Not quite an error (the calculation is correct). It just don't make sense for me why Apple come up with this magic 462ppi instead of 489ppi.