Some points (Directly taken from the above article by the author):
-"You will note that I conveniently exclude SNES cartridges that contain additional hardware inside of them, such as the SuperFX and SA-1 coprocessors".
-"Finally, I don't even claim to have true 100% compatibility. Merely, known compatibility. You see, I fully expect more bugs to be found with time. In fact, it's practically inevitable that someone will discover a bug eventually. And I will do my best to fix said bugs at that time. I've merely claimed that I have achieved this compatibility rate at this specific point in time. Which is, as far as I know, a first for SNES emulation. Of course, it would be much easier to claim no known bugs if no software was tested on an emulator. The thing that stands out here is that all known software has been tested, and by two separate people not involved in the development of bsnes".
Regardless, bsnes is still an impressive emulator and the most accurate in what it does emulate. However, as the author himself stated:
"Right off the bat, I would like to apologize if this section appears arrogant or condescending to the hard work of others. I admit to being a bit too prideful of my claim here".