Detonation (I have no idea if that happens in this case) would eventually cause various damage but would not, AIUI, cause cylinder scoring.
I have no exp of aero engines but a fair bit by way of preparing motorcycle race engines ( 2 & 4 stroke) and have witnessed the destructive powers of detonation and many a ruined bore (usually caused by the use of regular pump fuel instead of a racing 'brew').
What generally happens is that the detonation nibbles away at the thin land above the top ring,eventually leaving the ring unsupported,bits break off and start engraving the bore.
Loss of compression can also be caused by the piston crown cracking right through.
I wouldn't dream of sending someone out on a motorbike in this condition,let alone an aeroplane
MM