"In fact, apart from very specific cases, I think that school is a bad thing, not worth doing even if it was free."
Very wrong. You're not going to become a doctor, lawyer, nurse, accountant, etc. by playing poker and traveling. You're not going to get recruited by an employer because you claim to have read a lot of books.
What the author is actually saying, but incorrectly applies to everyone (startup bubble thinking, maybe?), is that for would-be startup founders, college may be obsolete. This is in no way, shape, or form, indicative of the value college provides to the rest of the population.
People have lots of motivations and reasons for attending college and many of them are completely valid, logically and economically.