"The fact that your love interest was kind enough to let you down in a friendly manner should make you feel pretty special."
Oh yes, here is your prize and gold star for being a decent human being about rejecting me politely as opposed to being a total jerk about it. I feel so special! THANK YOU!
While I disagree with a lot of what the article says, I do agree that just because a woman isn't interested in you romantically doesn't mean you can't be friends, or that you are a chump if you accept her offer of friendship. I don't think rejection of romantic interest should always be met with NC.
The way I see it, the problem comes from how most AFCs will handle the friendship: They maintain the mindset that if they form a friendship with her, it will eventually lead to romance, they get one-itis over her, they put too much of their time and energy into her, and they don't focus on dating other women. That's the guy's fault. They can also become her emotional tampon and male-orbiter in a one-sided friendship that only she benefits from. That's both the guy's fault and the girl's fault. His for accepting it. Her's for using him for it.
If you like the girl as a person and are interested in a platonic friendship with her, there's nothing wrong with that, so long as the friendship is mutually beneficial. If you form the friendship and it feels one-sided, then you drop her like you would any other friend, male or female.
At the same time, there are some women you are only interested in romantically - it could be because you are too attracted to her to be her friend (having more of an abundance mindset could help cure this but let's be honest, if she's a 10.....), or because you are only interested in her for sex.
Having more female friends does a lot of good things for your dating life. They have friends, and when you go to a bar or party with several of your female friends, you have instant cred with other women there. At the very least, the other women know you aren't going to turn them into a skin-suit.