Found the SMS Remix!
From The Lost Media Wiki
I viewed the page source for the 1up Box Unboxing! html file and I found the entire Super Mario Sunshine Remix link. It is the song used at the end of his SMS Hacking video. I still don't know why he would link it in the description of this video, though. Here it is: https://www.youtube.com/watch?v=RDR3fm3hUwg