but what you just mentioned is I think the point of the post

No, and that's what he meant when he said:

The poster has obviously never been suicidal and it shows

People who are suicidal because of depression aren't depressed because they are bored. They're suicidal because major depression robs you of everything that makes life worth living. Food doesn't taste anything, comedy isn't funny, the outside air doesn't smell good, being hugged isn't comfy, fire isn't warm - you're trapped in a state of being unable to find any kind of enjoyment, happiness or relief. Literally everything in the world feels gray, dull and completely worthless.

A really deep depression steals the ability to find motivation to do any of the things Anon lists, much less enjoy them. You feel like you're watching yourself from the outside, and all you see is a person who is numb to the world, so far removed and detached that there is nothing you can do create a spark. You feel alone, but not in how you miss company... because you don't; you realize that you are alone in your plight, in how you feel, and that makes it impossible to talk to people in any significant way. You live in two different worlds - theirs has color, taste, smell and hope, while yours doesn't have any of those things. Even if they are sad, they'll find little things to be happy about throughout the day. Maybe they've had a rough week, but that will pass. You won't find little things to be happy about. Things won't get better next week for you.

The advice is good for people who feel they are in a rut, or "don't know who they are anymore". If you have an identity crisis, if you feel like you've wasted your life away in a cubicle, or whatever have you, the advice is great.

But it's not good advice for people who are suicidal because of deep depression - hell, it's not even bad advice, because it's not advice at all. It's just another point on a list of things that don't matter at all.