My understanding from a friend who has one of these machines is that while 120Hz works, VRR does not and so the panel can’t clock down to save battery life when you’re just idling staring at a terminal.
(Not that I know all that well how good Linux machines are at clocking down anyway - my XPS and desktop both have VRR panels, but for all I know Niri runs them at full bore at all times - haven’t tried to measure, wouldn’t even know where to start)