I don’t think they were ever immortal, just long lived. It explains why there were a bunch of little kids in the city, they had to procreate to keep the population stable.
Virtually immortal can mean anything. Virtually immortal just means “not immortal but almost- meaning they were very long-lived that it seemed like they were immortal”.
Which translates to “lived really really long”, which means nothing. To us humans, 10000 years is really really long but so is a thousand.
The Nightborne are eternal, not immortal
Folks are forgetting that the Nightborne’s close proximity to the Eye of Aman’thul infused everyone in Suramar with the titan’s essence. (There was a quest to collect said essence from the Nighthold.)
Given he’s the literal time titan, that probably plays a role in their immortality.
I’d imagine future Nightborne born away from that power probably wouldn’t be so long-lived. But it’s all speculation because unlike the Night Elves, there’s been no mention of the Nightborne losing their immortality or feeling their age.
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or maybe those are descendants of the original Moon Guard.
I second this. The Night Elves got their immortality from Nozdormu. Aman’Thul is the one who gave Nozdormu his powers. The Nightwell that the Nightborne feed off of is also siphoning power from Aman’Thul in some way.
If it makes you happy, Demons and Satyr are still immortal. Naga too.
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Yeah 
It does. I’d like it more though. 
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With both the Well and the Nightwell gone, the Nightborne have joined the rest of us in the Mortality Club.
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Doness is that you? 
But at the end of the Nightbourne campaign, the Nightwell is put permanently out of commisison.
(Denona Donessed by Alynsa)
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They said it was dying. I don’t think it has been clearly stated it is dead entirely. I’m holding out hope some rogue Nightborne stabilized it. What was Thalyssra thinking?!?!
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They made the decision to give it up because of reasons I can’t recall right now. But they made sense at the time.
I say they aren’t, for two reasons.
One, because the Nightwell gave them a lot of power and they chose to let it die.
Two, because it’s a Blizzard cliché that if a good character has superhuman powers, they will often give up those powers (eg; the Night Elves, the Dragon Aspects, Tyrael, the Protoss…)
The Nightwell was allowed to fade because the Pillar of Creation that maintained it was deactivated with Gul’dan’s defeat and then needed elsewhere to seal the Legion’s portal in the Tomb of Sargeras.
Plus when it comes to playable races, WoW adheres to the tired trope of immortality being arbitrarily immoral, and people being somehow inherently more virtuous when they have an expiration date.
In the end it probably doesn’t matter all that much, natural elven lifespans are so long that the difference is going to be theoretical unless they do a several millenia-long time skip
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They have time magic and they have the arcandor which rejuvinated all those that were withering. The last arcandor created the Fal’dorai when it exploded who are still going strong. My guess is they might not be immortal, but more than capable of existing on borrowed time as long as they need to.
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The arcandor enables them to live a normal lifespan without Withering. It is by no means, a substitute for the now extinguished Nightwell.