Possibly. It's complicated. It's not uncommon for Company A to produce a design based on Company B's proprietary R&D. Just because Samsung is making those displays for Apple doesn't mean that Apple didn't do major parts of the R&D. Nor does it mean that Samsung can make the same displays for Samsung, or for their other customers.

Just because something is possible doesn't mean we can deny ground truth. Apple did not invent folded screens by any stretch of the imagination, and is the latest one to the party, even for Apples standard of "freshness" it is late.