Some of its features are:
-Adds a blast wave effect which adds timed and scaled secondary explosions on top of game objects
-Object geometry within blast wave changes damage intensity
-Additional damage boost for structures since they are hard to kill, even if very close to large explosions.
-Damage model for ground units that will disable their weapons and ability to move with partial damage before they are killed.
https://forum.dcs.world/topic/289290-splash-damage-20-script-make-explosions-better/