No, no, no. Chunky salsa's the name for the effect of using grenades or other area weapons in confined spaces: the blast bounces off of walls repeatedly, increasing damage.
In case of a flashbang exploding in a 2m wide hallway, the damage would be, uhm, I think about 38S, -3AP.... So yeah, good to know they won't overflow to physical... (And that's ignoring bouncing from the ceiling.)
But we still have to see how this all turns out, could be it won't even come up.