It doesn't look right to me. Although, his autograph has varied allot over the years.
I would only buy a Lebron with an Upper Deck COA (with whom he has an exclusive contract) or a certified autographed card from one of the major sports card manufactures. They are high $$$ but you know your getting the real deal. Almost everything else out there which is claimed to be Lebron or Jordan I would stay clear.
Lebron is one of those guys where there really aren't any deals. The real items sell for high $$. And they are almost all Upper Deck.
Here are some examples of his Upper Deck item and his early (rookie) autograph on a card.