Having been a "minimalism-addict", I've come to the conclusion that the best part is the act of getting rid of things , not the act of having few things . Getting rid of junk is liberating; living with 15 things is just a pain in the ass.
Absolutely... the spirit of reducing waste and consumerism is admirable, but this guy is being ridiculous by claiming that he only owns "15 things". Not only is he missing the point, but his hyperbole is out of control. A toiletry kit is 1 item? Right. Bike Snob NYC has a hilarious post on Hyde if you haven't seen it: http://bikesnobnyc.blogspot.com/2011/05/paring-down-and-pair...
It's worth noting that he hasn't stopped. http://bikesnobnyc.blogspot.com/2011/12/2011-year-walls-kept... is quite excellent, with such lines as, "So, being the good minimalist that he is, he immediately paid way too much for almost nothing."
I think the truth is somewhere between the two hyperboles. Gram Hill's minimalism as an overriding cause is taken to completely silly extremes. However, the principle of getting rid of shit you don't need (and better yet, not buying shit you don't need in the first place) is quite sound.