By 2022 12nm will be severely outdated for smartphone SoCs. Even 7nm will likely be used in mid end chips.
They would have a lot more success with 12nm chips in phone baseband towers or automotive smart chips for electric cars.
Will it?
For testing, we got a Huawei P20 pro back in 2017. I still think it is a better phone than the Samsung note 10 that I'm using. It had better video stabilization and processing than my Samsung or my wife's iPhone 11Max. It's finger print and rotation sensor is superior to the Samsung I got 2 years later.
The p20 used Kirin 970 (10 nm).
Remember, Androids have traditionally been over spec in order to compensate the inefficiencies that a mini VMs utilize. Apple have done more with less using an optimized kernel.
So while a 12nm Kirin might not be absolutely cutting edge, it will be more than adequate for most users, just as Huawei P20 pro is still good, if I still had it.
Also, there is a chance that Harmony OS will cast off inefficiencies by conforming to a single architecture/platform.