(a) Assume the author is very stupid and then tell him the very stupid and obvious answer.
(b) Interpret the question as rhetorical.
People who take (a) are the type of people who think they're smarter than everyone else, but who are actually, in fact, dumber. Usually they lack empathy, are undersocialized, and probably show on the autism spectrum.
People who take (b) are the type of people who correctly interpret the statement.
The correct interpretation of my rhetorical question is to read it as a commentary on authority. Is this 1800 rated 19 year old really the proper authority to learn how to play chess? Wouldn't a professional chess teacher with decades of experience and a higher rating than 1800 be the correct authority to instruct us on the best methods to learn chess? Yes. They would be. There are thousands of these teachers.
Instead of pushing blogspam by amateurs onto the frontpage, if HN really wants to know how to learn chess, HN should just link one of the dozens of much more reputable books on this topic.
As a chess player all I can do is roll my eyes when a 19 year old with an 1800 rating and very few (none?) years of chess teaching experience proclaims himself an expert and gets upvoted for it. It's just absurd.