It is a bunker busting bomb.
That doesn't mean much, because unless we know how big the target is, we can't really know how big of a bunker was actually busted.
A 100kg SDB is actually quite capable at knocking out smaller bunkers, and by definition can be called a bunker busting bomb.
But there is a difference between a 100kg SDB, a 1 ton class GBU-27, a 2.3 ton GBU-28 or a 12 ton MOP. They can all be called bunker busters, but the scale and depth of the bunker they are each intended to defeat is quite different.
So, asking about the blast effect is not unreasonable, and if we actually had dimensions of the target we could possibly try to surmise what weight class this bomb is in.