Don't be depressed. It's false that any reasonably good programmer can get a job at those companies. There are plenty of reasons why you may not get a job at any of them (bad luck, peer competition, interview antipatterns (google Yegge on this), maybe algorithms aren't your strong suit, ageism, etc). Even worse, from initial rejections you can spiral down into anxiety that will hinder you in future interviews, and listen to this: you cannot tell a person not to get anxious at the prospect of rejection, either.

People who say it's easy are arguing from an optimistic point of view specifically addressed as unhelpful at the start of the article.

Don't be. There's a lot of luck involved in the interview process and most people who had luck on their side won't understand this.