[mkn]

"Human hearing is limited to 20k because frequencies higher than that are perceived as painful? Dont agree with that one."

Yeah, that's a silly one. I disagree with it, too. It's a good thing it appears nowhere in the fine article. Are you actually confused about the difference between frequency and amplitude? Or did you misread the article?

"24 bit doesn't offer any advantages to sound quality? Sheesh."

As brazzy rightly points out, "Sheesh" isn't a reasoned statement. It's an ejaculation. And, it turns out, the author talked about why sound engineers record with 24 bits; It has to do with pragmatic reasons about leaving room for the highest and lowest frequencies in the audio being recorded without clipping, as well as with the author's discussion of Nyquist considerations in the distributed product.

Your post is wrong in so many ways that would have been easily fixed by reading the linked article with even 8th-grade reading skills that the reasonable reader has to wonder if you're being deliberately obtuse. Are you?