Who buys these things?
All these foldable tech phones are expensive, fragile and lumpy gimmicks. The Samsung Z fold phones being a case in point - 2x as thick as a regular phone with a greater propensity to break due to the scratchy screen and difficulty of protecting the device. Yeah I guess it's great you have a (small) tablet if you need one, but the rest of the time it's a brick with a crappy outside screen.
What purpose is this Lenovo phone / laptop demo even serving a roller / slide mechanism? If it were a general production device (instead of a mockup) it would need to be a thicker case, bulge or wedge shape to accommodate the roller just so the screen can grow an inch or two. Not to mention the likelihood that grit, dust, makeup, would get behind the screen and into the roller mechanism ultimately destroying it. I wonder how many people would pay a premium for that.