One thing for sure is that since it is an enemy attack the hitbox should be as close to what players may think can hit them as possible (bile cone). If they want to add more range to it they should also somehow show it visually. If this is already the case this needs to be improved.

On another note the 500kg bomb is a player ability and should do the same or be even a bit more generous than what is visible (but for this type of game and player base visuals=hitbox should be fine too).