Could you explain more about this part?
"Select the modGRUBShell option at startup (OpenCore boot selection page). At the grub prompt, enter the following commands (the first line unlocks CFG, the second line unlocks overclocking)."
Is that the modGRUBShell found in your EFI folder inside Tools called modGRUBShell.efi?
Also, I saw that the guide said that we can enable something called the AppleXcomCfgLock in case we do not disable CFG lock in Bios (which I couldn't find in the Dell XPS bios)
In case I do not disable the CFG lock, would this work?