yeah im only 5 years behind the times lol. Just discovered this (or rediscovered, can't make up my mind or not if I downloaded this years back or not, I certainly didn't put many miles on it) recently and its a great layout.
Since starting to mess with track modding myself i've found myself trying (and enjoying) other scratch made stuff even if its unfinished just to see how others go about making things.
Strictly speaking I wouldn't say this is a 5 star mod if you assume a final Lilski/Fat-Alfie style track is the benchmark, but when you take into account how long ago this was done, and the fact its so obviously WIP i have no issues rating it that much. Its clearly got the potential to be a top track mod once complete, and even incomplete its a lot of fun :)
I wasn't aware the people should only be present on higher world settings. I'll edit this for the next update.
There sure are a lot of them, for Assen having the longest continuous grandstand of Europe, I believe. For now, you can lower their numbers manually. The files are located in /ne_ttassen/.../data/camera_facing.ini ("..." being autosport/motorsport/etc.). Adjust the "ELEMENTS=..." to something lower or simply delete the whole file(s).