You are incorrect, and mummymonkey is correct. He is not the only one who does those things, and others don't claim NLP. DB, in fact, denounces NLP in his latest book.I've seen him use these techniques. There is no question whether he does or doesn't. Just check out some of his work in youtube. It's clear he uses these techniques and there is no other way of him 'knowing' these things.
ETA: Re-reading my post, I see that it comes across as harsh. I don't intend it that way. Your conclusion that Derren Brown actually uses those techniques is reasonable if, as I surmise from your age (posted on your profile), you are unfamiliar with magic and with the things Derren Brown has written.
Two important points that I hope you learn sooner rather than later are these:
1. People deceive other people, sometimes intentionally, sometimes not; sometimes with ill intent, sometimes not.
2. The fact that you can't think of how something is done does not mean someone else can't think of how to do it.
Best wishes
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