[jman220]

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But to make his hand he needed to add his own cards. If he adds an ace of spades for example what is to stop one of the other players he is HU with having the original one?

If I'm missing something then my bad. But its hard to tell as the article is in german

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This is how it would work:

At some point, somehow, he grabs a card from the deck, either by palming it while the dealer isn't looking (he's sitting in seat 1 remember), or by mucking his hand with only one card, and keeping the other. He slips this card up his sleeve. Now, it turns out that card is the five of clubs. A few hands later, he is dealt 4/5 suited. He calls and sees a flop. The flop is Ace King 5. He switches the 4 in his hand for the 5 up his sleeve, boom, set of fives. There are no extra cards. you see how it works?