Wikipedia is not an authority.

Refer to dictionary.com

http://dictionary.reference.com/browse/sweatshop

If you know what he's trying to say, then why did you bother?

Apparently you need to look up the meaning of sweatshop. I know what you're trying to say, but your headline is a bit exaggerated if not downright misleading.

If workers at Apple said they enjoy working there, then it surely cannot be called a sweatshop, because nobody enjoys working at a true sweatshop.

Just look at this wiki for what the word sweatshop really represents:
http://en.wikipedia.org/wiki/Sweatshop