The real question is. What is the actual market for a foldable iPhone?
You might be on to something there. Odd on a site that caters to a device and manufacturer that sells a lot based on cache'. It's clearly sort of aspirational to own a folding phone, in some circles, just as it is to own an iPhone, in some circles.
Personally, I own a Surface Duo, and a Pixel Fold. Neither really makes my life substantially better than the plain slab iPhone and Pixel I own. I prefer the latter two. For Apple users, if you want a slightly bigger screen get an iPad Mini. You can do that and an iPhone for less than almost any foldable. Women can fit those in a purse, guys, get cargo pants.
For what it's worth, I think the Surface Duo is actually more useful than the Pixel Fold. MS did a super job in support for multitasking, which to me, is the best reason for a foldable, not more screen real estate. Shame they couldn't make a case for it.