I knew what an SDB was, been working on systems to support accurate deployment of this for awhile. I had just never seen one in action. Designed to literally be dropped from high altitude where the plane/drone cant be seen or heard, and fly into the chimney of an apartment, devastate the inside of the apartment, and leave the neighbors undisturbed...well, more or less. :)
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.
Altitude to be dropped varies and is not restricted to high altitude.
It has wings that pop out and it can fly and be re-targeted in-flight if need be.
Very precise.