Not sure what he means. Coders were trying 3D and polygon engines on low spec machines for years, like 8 MHZ CPU with no additional hardware support, and even on C64. Sometimes with impressive results. So I'm not sure what was soo risky about working on a fairly advanced hardware with RISC tech and true hardware support for fast polygon graphics.
Power Drive Rally is utterly unimpressive for a machine like the Jaguar, as mostly any pseudo 3D sprite based racer would be.
Fairly impressed with it's debut Cybermorph, I was quite enthusiatic about the prospect of polygon racers for the Jaguar, as the machine looked to be very capable (for the time). Back in 1994 I hoped for some kind of Off Road polygon racer with dynamic suspension, and ironically I can play something similar with the port of "Stunt Car Racer". That thing is a better game than both CF and Club Drive (needless to say, that game is a joke) , originally programmed for a 8 MHZ CPU machine. Unfortunality Geoff Crammond did not work for Atari, to me that was the true issue, actually only few coders could handle the Jaguar, especially under the circumstances how Atari managed software development.