Hmm... Shall have to reserve judgement until/if I read it, but what's being described doesn't sound terribly different to what ordinary Aliens should mostly be capable of.
If they're being deployed to kill everything in the immediate area, army ant-style, I still say a simple missile with a warhead would get the job done a lot quicker and more efficiently. The only reason I can imagine Aliens being used for such a purpose is the terror factor - but that's a steep price to pay when other weapons would be much more effective.
Prediction: Whatever group is controlling the Aliens will find themselves overwhelmed in the same way ye olde General Spears did, complete with a cry of, "They were just using
us, all alooooong!"