un-predatable? I've seen plenty of predators in Africa happily munching away on giraffe carcasses. There are even a few lion prides who specialize in hunting elephants, but giraffes are commonly prey.
So I happily bow to local / expert knowledge, but my understanding is that giraffe deaths by lions are fairly rare and even when they are eaten scavenging is involved.
I think it is certainly true that healthy adults are less likely to get taken than the old, sick, or young, as the Wikipedia article points out. But that's true for many prey species.
Here's an apropos shot I took of a lion family in the
Linyanti Swamps in Northern Botswana enjoying their giraffe kill- https://www.skeptical.org/lionseating.jpg (and to Wikipedia's point, this one was definitely young).