Welcome to TGC mough. Cracked ring land? The rings of the piston? Cracked piston? If anything, that should develop a leak and should be a lack of compression which counters knock, lol. I just hope the dealer is reliable and isn't giving you a line of B.S. I would ask them what they did to diagnose and come to that conclusion or show you the damaged part when they are done. If it really is pre-ignition that's causing a knock, higher octane gas should of taken care of that but it sounds like you have something a lot more serious. Good luck with getting to the bottom of it.
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