A reviewer from HDTVtest has discovered that not all 42-in LG C2 TVs currently available in stores contain the latest OLED EX technology. LG explained that, due to a supply chain issue, it was shipping some of these smaller TVs with the older WBC OLED panels and that it would resolve the matter later this year.
https://www.notebookcheck.net/LG-confirms-that-some-C2-Smart-TVs-will-not-have-an-OLED-EX-panel-as-advertised.612105.0.html