From OP's link:
The globetrotting, high-rise 911 with a 3.0-liter flat-six was delivered to Polish rally driver Sobislav Zasada, and he and co-driver Wojciecj Schramm entered it in the 1977 London-Sydney Marathon. That single event put more than 18,500 racing miles on the chassis, with Zasada and Schramm leading all the way into Australia before bogging down in deep sand Down Under.
Sobislav Zasada has a Wiki page and was a successful driver with several rally championships and a successful auto/utility vehicle related business career. Says he owned factories.
https://en.wikipedia.org/wiki/Sobies%C5%82aw_Zasada