Huawei has unveiled a self-developed operating system called the HarmonyOS NEXT. At the development event, the CEO described the OS as fully independent with a full-stack AI framework. The CEO has also claimed that the Harmony kernel is three times more efficient than Linux.
It is a multikernel OS. It can use the Linux kernel (usually on more powerful phones), or switch to a lighter kernel Huawei built (on weaker phones / IoT stuff). I’m guessing they are saying here that the lighter kernel is much more efficient, at least for the tasks it is optimised for.