It can't kill through walls. At least I've never seen it happen.
If you have a clip then show me, but until I get proof I'm going to assume this is just an exaggeration.
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NW got me around corners multiple times, and at least one time where a huge -blam!-ing rock was in between us, where the warlock didn’t have line-of-sight in all cases. And the dude wasn’t vertical/above me. Why should I incur damage, especially fatal, if there’s no clear LoS? First time I saw that BS I said, “Bungie’s gonna scale that back without a doubt.” I never request supers to be nerfed but fine-tuned if necessary. Blade Barrage is another example - I get wiped when the Hunter clearly has his back towards me, as in, didn’t originally aim at me (or was even aware of my location). My mistake was simply peaking around a corner to headshot. I haven’t played Warlock or Hunter in Forsaken yet, so don’t know their supers’ descriptions. But it seems they pick up extra unearned kills in PvP.