chahahc I really need to research how I could reliably test if the screen has black frame insertion or not. From what I know, monitors that use BFI employ it by using PWM, that is, turning off the backlight, which this monitor obviously can't do. Of course I don't discount that the same couldn't be done by inserting an actual frame where every pixel was set to black (a type of BFI which isn't really used in the monitor industry), but inserting a black frame for a monitor that only does 60 Hz refresh rate would rather be counterproductive for a monitor solely reliant on ambient light, because that could/would yield decreased brightness.
Still I'm curious on whether this was the case. However, it could take some time to do that as I would probably need a camera that can record at 120 frames per second which I unfortunately do not own.