This article is awesome.
If people don't want it to be advice, then don't take it as advice. It's just another anecdote to put inside your little book of anecdotes.
The thing is, the OP is targeting his advice at people who are in similar situations to him - people who know that university is moving too slowly, is too expensive, and not right for them.
His advice clearly isn't prescriptive to everyone. It is worth noting his circumstances. He may not have had the opportunity to attend a university that stimulated him. Attending a State College may have been cheaper, but even worse from a quality perspective.
Nobody knows. Point is, instead of judging the guy, why don't you read the piece for what it is - a story about how, for some people (and an increasing number of people at that), college is their biggest mistake. And you will notice that the title reads 'College is my biggest mistake' - not necessarily yours.
ps Statistics about populations of people who don't graduate are useless, as it clearly includes all sorts of idiots, drug addicts and fools who are on the wrong side of the bell curve. Show me statistics on people who drop out of degrees two years in to pursue entrepreneurial opportunities vs the graduating population and I might pay attention.