CTRA admins do what they want in their servers. period.
If you want to race the FE2 track without those additions, just join another server. It is as simple as that
By the way, adding a few tires to sligthly modify a track, or adding a chicane doesn't make it an autocross/slalom track. There are plenty of examples of real tracks where chicane are added regularly with tires to cope with safety issues, for example when the cars are too fast in a particular area and because safety requirements have been raised since the build of the track.