Everyone's pedagogical requirements vary, and decorators are notoriously hard to explain[0], but seeing something like "A decorator in Python is a function that accepts another function as an argument." as a flat statement at the beginning of the article is an immediate turn-off for me, since I can easily see someone who is still learning about Python in general extrapolating from this to conclude, say, that map(), reduce(), and filter() are decorators as well. It's just a bad start to the article IMO and I didn't bother reading much further.
[0] http://pythonconquerstheuniverse.wordpress.com/2012/04/29/py...