This is likely a mini-LED screen that Apple has been putting into the iPad Pro and MBPs, which is not a technology LG possesses. This is likely manufactured in Taiwan or China or Germany, using the licensed technology from Taiwan's Epistar.
There is no evidence for that. It is more than likely an LG display, as Apple has been rumored to work be working with LG on Apple branded displays, and they are the only producer (so far) of 27 inch 5K displays.
