It is. That adapter (and every other) doesn’t support 4k @120 from a Mac…. HDMI 2.1 does. So if you have an LG OLED C1, and want to also use it as a Mac Monitor there is no way to connect it and not be hobbled. Not a huge deal to me right now, but a new MacBook Pro should last many many years. Sucks to start it off with an HDMI port from years ago. (less)