Pretty sure it is, but the model of the castle is not correct. Very sloppy modding. Somebody didn't do their homework: the tower needs to be on the right side from this point of view!
With essential bugs like this I will not download...
Afaik, this is the geoff crammonds first simulation. Or 3rd, as this is REVS 4 tracks and yes, it's commodore 64 version running Nurburgring nordschleife, which was the fouth track in this version. Original REVS was released for bbc micro as early as 1984.
The game had true simulation engine, simulating suspension and engine. It was waaayyy ahead of it's time and that showed in its running speed. C64 version was faster than the older hw versions, but it was hardly playable. The legendary c64 turbocard SuperCPU got optimized version, but even being doubled crunchin power of 6510 cpu, game was said to be "still hardly playable, yet faster."