Yeah. Not much to say about this. It covers all of the basics...gives them a bit more substance/place in their home planes without destroying their respective canons. All in all a good article without any surprises or unnecessary [or outright destructive] additions/changes. Yay!
Why he didn't just include the sylph and triton (or some other air/water relevant elemental beings) to round out this article, I'm not sure. Just rushed this week, I guess...or, why get into one column what you can use for material for two or more weeks? hahaha. I can appreciate that.
EDIT: I did like the distinction under xorn as being intelligent but not "civilized". finally breaking the "everything has a culture" a.k.a. "should there be cities of umber hulks?" nonsense.
I generally play xorns (which has not been often) as something akin to rock-otyughs. Just enough intelligence to not be automatically hostile...could potentially be informative of the immediate area if some mode of communication is available...but will show up, hold out one [or three] of its hands and insist/ask adventurers "Has Gems?", "You Gold?", "Bearded man smell like Silver. Food for me? Me hungry."
/EDIT