Gonna have to stop ya there, good sir. It DOES work on the ground. Its just that the air version is just 3 frames after the superflash. Ground version is punishable as fuck due to being 10 frames, so you might be thinking it only works in the air because of it. Sorry for the invasion.
Ground version can be mashed out of by your As and Bs or throws, because its slow as all hell.
Air version is 3 frames. The only ways to beat it are as follows:
A. OD
B. DP or invincible move
C. Any move with a hitbox on your person, and it has to be active DURING the superflash.
Any of those options will beat the super clean. But best way to avoid it is to just stay grounded, wait until the superflash, and react with fast moves accordingly.
Again, sorry for invading here, but I figured I should clear up a few misconceptions about Bang's TEN THOUSAND HURRICANE EXPLOSION command grab super. Thank you and have a great day