Yes, a really good concept.
I Googled “blast radius” for the SDB, and came up with 50 feet.
Like you, I thought the blast radius on the video was quite small, so I assumed a rocket.
Also, on open ground like that, I assume they want a fragmentation weapon, and my understanding is that the SDB is a penetration weapon first, and a fragmentation weapon second.
I think like most bombs, there are several options for the warhead to choose from. Could be proximity frag, could be penetrator, etc.
SDB is not a penetrator. It has some inherent penetration capability to punch through walls and such, but it is primarily an anti-personnel/lightly armored weapon.
Looks like the bomb (SDB?) impacted about 12 feet away from the perps...so does “close enough for hand grenades and nukes...” apply to SDB’s? ;-)