Huh, where's that fluff from?
The suggested profile would make sense in this context - though I'm not sure if the damage is not a wee bit too pitiful. Together with the lack of the Reliable trait (which would seem to conflict with the Necromunda core rulebook's description), it might make the autogun a clearly superior choice in that you'd get more damage, more range, more RoF and the ability to use special ammo. Conversely, the NP profile's only advantage is +20 rounds in the clip. Given the urban environment, you can't even play up supply issues as an argument for las over autoweapons.
Unless we'd also change the profile of the autogun. Or accept that the NP would be the "poor man's autorifle" in that its owners don't have to buy their ammo but can readily recharge their power packs at some semi-public energy source.
Come to think of it, maintaining a steady influx of bullets should probably be a factor. In games of DH etc this tends to be marginalised out of narrative focus and the characters' resources, but in a game about daily life in the underhive, keeping stocked up on bullets should be a thing, with its very own subsection in the trade/economy rules.