Why do these things exist?

I mean I do understand the appeal of the idea of folding smartphones, but I did not hear about any miracle material breakthroughs lately. So.. how can this exist? Why does it say that it is durable, when it has to be made out of materials that cannot be durable or else they wouldn't fold.

Did something change there and I'm just using stale data for that assessment, or is "durability" just not as valuable to the target audience?