I noticed the same error you did, and I agree the OP article doesn't tell us much about why this result is important, but I actually thought the OP article did

I noticed the same error you did, and I agree the OP article doesn't tell us much about why this result is important, but I actually thought the OP article did a better job of explaining complexity classes at an extremely elementary level (not relying on what a polynomial is) than other articles I've seen