All writing does not make noise. However, when writing makes noise, it's easy to distinguish whether there are letters being written or letters are being underlined.
If it's possible to hear the sound of writing, as in this case, it likely reflects the psychology of the writer(s) at the time. They could, for instance, be in a rage.
Having a hearing limitation must be very difficult,
@CSIDreamer .... FYI for your (and maybe some other folks') general knowledge. different types of pens can make different sounds. When I was a child, I was required to use "dip pens" (like quills with metal nibs); the ink would splatter and the nib made a scratchy sound as the drop of ink finished and the nib went dry. I kinda think a teacher could hear the splatter and not just ink splotches all over the place.
With a fountain pen (the newer version of a dip pen: it had a reservoir where you could fill it with ink), you might be able to hear a glide or a squeak. You could tell how fast someone was writing and when they placed a full-stop (period).
We weren't allowed to use ball points for school work, and they weren't common in my world. We used them for spirographs (remember those?). The sound depended on how hard you pressed. Ergo, if you can hear LV and CD applying ink to paper, they have a lot of tension in their hands and are applying a lot of energy. Rage, I would guess. Fear? Could be both.
Sharpies have a certain sound, too.
On this topic, a Mac sounds different from a PC. They tried removing the tapping sounds, but that was a catastrophe. People couldn't handle it. So, yes, writing makes a sound.
If LE saw that pad of paper, they'd likely to be able to read it several sheets down.