I am fairly sure you misunderstand him. He is talking about the extended 60 range of the BBB. Is "buff" the 100% correct word for that? No, but in the context of the whole paragraph, I understand the BBB's extended range. But maybe Mr. Carmine can clarify.
The brumbar regurarly kills more then one model in a single shot as well as damaging quite a few as well. Ofcourse when it hits.
The bbb a while back had less range then currently. It made the ability quite underwelming.
I dont know if the intervall between rounds in the bbb is the the same as then but imo when the range was shorte, afaik the same as the regular shell (45) the low intervall made sense. The brumbar was mostly in range of dedicated at units.
Right now it can fire the bbb from 60 range with imo to low interval. For 30 munition (i was under the assumption it was 15 before) while far deadlier for 5 muni difference it to cheap imo. There are abilities as deadly or close wich cost more and are easier to stop/counteract.
You often hear that wiping abilities are bad for the game, yet usualy when it involves late game units from axis mostly but also allies sometimes its fine when they hit so hard that vetted units get wrecked in a single shot or seconds.