More like used a camcorder and had it zoomed in.
Plus, the person who made it is female according to the person's name in the channel description. (why yes, I am one of the few people who reads them)
Some hackers or something did find a way to dump DSiWare gaemz, but it is useless since you can't play them. It would be useless. Just like the 3DS ROMs that are floating on the interwebz (it is impossible to play them on a regular flashcart...provided the damn thing boots on a 3DS. You need a 3DS flashcart, which doesn't exist at the time of this post.)
There aren't that many flashcarts that work on a DSi and there's really only one that enables DSi mode (the rest that are compatible only works in DS mode).
Not related:
I haz R4 flashcart.
DSLite >>>>>>>>>>>> DSi/XL