I haven't seen anything that says all 21 million people had problems. All I see is another sensationalistic headline from TechCrunch.

There is a plug at the end because that's how blogs make money; by selling links and paid mentions.

They probably didn't make it up. I watched on Hulu and it had real problems for me, too. And CNN was impossible. It's possible most Internet users have never even heard of Hulu, and they were the best case.