There is implied credit being given, and Jobs knows this. He doesn't bother to correct it, document publicly who designs things, or let Ive speak to the press and take credit himself. All of these are tantamount to taking credit. If credit comes your way and you do not deflect it or recognize the true author, you are taking credit.

And Jobs has done this ever since he worked on Breakout with Wozniak, so it is unsurprising.