If you're looking for the engineering side though you might be disappointed, there isn't much technical content here. It's more of a hackers guide to getting something working.
I feel that it tells the story of many makers, and I see myself in it. I can feel his face wearing out and I see it in my face when I couldn't get something to work so badly. I'm sure anyone who has ever worked on a hard project can also empathize. At least this project I can feel like it's just small hardware that is the obstacle, the flash chip probably has a datasheet somewhere to make the whole process possible.
Watching his other memory upgrade video, I couldn't imagine how much work that is to reverse engineer the flash memory contents of the iPhone chip to change its configuration. I wonder how much sweat, labor, and ingenuity went into that software. And we probably will never get to know who it is that is behind that software.