If he is in Beijing, I agree. Hong Hong is quite it's own place.
I think he made one of the best choices he could but, as he says, he can't ensure his own safety anywhere really.
China has been engaged in massive cyber espionage themselves. Everyone knows it, but no one can prove it beyond a shadow of a doubt, so they keep denying it, and nothing of consequence happens.
They could whisk Snowden off to a secret interrogation site, and then blame the CIA and say the US government snatched him. Who is the media going to believe and who can prove otherwise?