Swervo

I'm not 100% certain, but reasonably close to it, that F1 cars had carbon fiber monocoques but were still using steel suspensions back in 1994. Also, I think the going theory is that lowered tire pressures due to the safety car period lead to his car running too low and bottoming out, which essentially makes the spring rate infinite, leading to a complete loss of control, not suspension failure. However, you are correct that the suspension then penetrated his helmet and killed him, which I'm thinking is also less likely with carbon than it is with a steel spear.