Indeed, Sony’s official word is that the X button is actually the cross button.
That has long been the case, but clearly it isn’t a well-known fact, given the stark difference in responses to Sony’s polling.
The X has long been a point of contention in product names. People often refer to Apple’s OS X operating system and iPhone X as “oh ess ecks” and “iPhone ecks” — but Apple thinks of those X symbols like the Latin numeral for 10, thus “OS ten” and “iPhone ten.”
That isn’t stopping anyone from calling them OS X and iPhone X, of course, and that clearly applies in Sony’s case as well.