I had actually stumbled across that thread before, but never actually thought to look at those things in more detail...
Out of all of those, Mario Cart, Hulk 2, and Digimon look like they're probably Sintax's work as well. Same official-looking "Only for Game Boy Advance" sidebar, and similar-looking fake ESRB ratings.
(And though its box style is entirely different, I have to wonder about the Hulk game with a random Crash Bandicoot picture on it...)