Worst of all, they appear to have returned to using PWM on their monitors again, on many of their 2017 models and not only those with VA panels:
e.g.
S25HG50 - 600Hz PWM (0-20% brightness)
S27H850 - 240Hz PWM (0-35% brightness)
C27H711 - 240Hz PWM (0-35% brightness)
C32HG70 - 360Hz PWM (0-95% brightness)