I'm pretty sure that model does not use PWM. Generally you can find the information on a specific model if it does, and that one does not result in any information regarding pulse width modulation when you google the model.
It has low blue light and flicker free certification so I'd assume it does not use PWM, although even if it did, most modern adaptations of PWM in monitors is undetectable as the LED is generally full on in most cases. I think you're fine.