As I said, I can't rule out they edited it. Shin is amazing, but he usually has a number of things I can spot, and these performances are way cleaner than the ones I usually see from him. That being said, these are also a third of the length and aren't his most complicated tricks yet as he is ramping up over his appearances in order to have something bigger to go to. (though they are part of his big tricks)This guy, though entertaining, is a career talent show act. He has been on Britain Got Talent and France Got Talent as well.
Not specifically quoting you but the general sentiment about Shin Lim and TV editing, It wouldn't surprise me if the TV network purposely edited the video for TV to make it more impressive when aired. They have a habit of doing that for magicians. Anyone remember Will Tsai and the coin matrix act? That one was proven to have been edited. (tho I'm sure it looked impressive live).
Note: I'm making a distinction of networks editing to make it more interesting vs the magician relying on camera tricks. Shin Lim doesn't need editing for his tricks to be impressive (as evidenced by his previous acts on YouTube, but networks are gonna do what they do to make it seem even more incredible. I bet it's just a part of being on AGT that they may or will edit.
Also.. this is as an aside, there are rumors that AGT would hire professional acts to make the show more interesting and varied. (otherwise it would be even more of a singing competition) Often these acts don't progress past a certain points so something to look out for. Aaron Crow is rumored to be one, and some people think Shin Lim is one too since he is already established and "famous" in some way.
but yeah there is a definite difference between editing to make things look more clean then actual camera tricks, just like there is a difference between camera tricks and tricking the camera.