That’s a nice find! That got me curious, and I ran across this clever little hack, in case folks aren’t comfortable adding that project to their system for whatever reason:
https://old.reddit.com/r/gnome/comments/kopjm0/still_no_way_to_adjust_touchpad_scrollspeed/gi0790a/
The gist is they override the detected trackpad dimensions, which affects the scroll speed, and then make the change persistent using a udev script.