Why would a name magazine pull a high-school stunt like that? The so-called "editor" must be an ignorant punk with no knowledge of journalism, no concept of ethics, and an event horizon of 2 weeks. Totally and inexcusably lame.
Not my argument but some consider the cover to be marketing, to attract attention on the news stand, while the insides are editorial.
Hey, look at the free hits and publicity the Mag. got for creating and using this cover shot.

I think someone is being a bit picky when you witness all the airbrushing, cloning and trimming that covers generally get for the news stand. Consider any issue of Cosmo for starters. Then the instances of body doubles and head pasting? This is not unusual and is very minor.