Will using normal unleaded kill the spark plugs and coil pack in a vrs?

May be,to avoid a warranty claim,but pre-ignition due to use of low octane fuel burns out spark plugs does it not?

Whilst on modern engines the management system should adjust settings for different fuels this does not always happen with total success.

Burns pistons and valves as well but I've yet to see it damage a coil

It's not det though

Coils burn out spark plugs and these engines are known to eat plugs , occums razor applies