For the last fucking time NO.
Learn what the term sell-out means before even asking yourself the question. Eminem working with X person is NOT selling out. It's what he does with them. A name does not = sell-out. Selling out means compromising your artistic integrity for money.
Now, not only did Em ask THEM but he didn't compromise ANYYYYYYYTTTHHHHIIIIIIINNNNNNGG on Recovery. All of his artistic integrities are as in tact as ever and he has never ever truly compromised them for anything.
Em did not and has never sold-out.