Probably just a simple oversight, maybe from testing the prerelease track without world details maxed out. AD is normally pretty meticulous, his car mods were always graphically head and shoulders above the vast majority of other conversions from the earliest days of AC modding and they still stand up well today, and there's often a folder included with manufacturer's info about the car, different trim options, driver suits etc.
I've been having a blast in a lot of AD cars lately and they still look and feel great even up against top-tier recent releases. I guess he followed proper pipeline guidelines before most modders were even aware of them? Who knows.
Anyway, not sure if AD checks in here any more but paging
@Showmebest66 to draw his attention to the floating spectators, just in case.