Somehow I forgot to subscribe to the thread, oops.
Thx for the tip @Fyren, fixed first thread.
@Powerlord, I need to know the hitgroup because I want the bomber to have a chance of exploding on chest/stomach hits and limb hits like the original plugin did. Said plugin and many other can be found here:
https://github.com/Daimyo21/Insurgency-dy-sourcemod
In any event, the answer to the question is yes; TraceAttack does not fire on these sort of deaths. However, the fix in this case is actually easy - just hook player_death and look for attacker 0, and trigger the explode on death chance function from there.
Now to figure out why TraceAttack isn't giving me correct damage values... But I'll make another thread for that. That is, if I can't figure it out on my own.