It's very dangerous, but I think "most serious practitioners die sooner or later" is an exaggeration. The number I see is 1 death per 500 jumps, which I assume is also biased towards people with less experience.
It might have been true for the pioneers of the sport though.
I (and probably the commenter you're replying to) meant wingsuit BASE jumping, who is considered one of the most dangerous sports in the world. I think it's borderline suicide. I think its practitioners are thrill seekers who want a higher and higher rush, much like an addiction, which has a high chance of killing them.
It's more dangerous than jumping from a plane with a wingsuit.
I'm under the impression that wing suit base jumping is a lot safer than it was 20 years ago due to design improvements, and I believe that's what the 1 in 500 number I see in a few articles comes from. I could be wrong, but it matches the impression I have from watching a few content creators doing it.
Yes, I'm basically referring to base jumping in a wingsuit though, as I say, it's not an activity I'm remotely interested in or have much knowledge of beyond some videos. Of course, serious/elite practitioners do quite a lot of jumps.
I read the fatality comment somewhere presumably somewhat authoritative but it was a while back.
It might have been true for the pioneers of the sport though.