"In this specific case, Lenovo's firmware defaults to "RAID" mode and doesn't allow you to change that. Since Linux has no support for the hardware when configured this way, you can't install Linux (distribution installers will boot, but won't find any storage device to install the OS to)."

This is a lie, you're obviously a schill.

Non-RAID settings were intentionally removed from the BIOS, and the RAID format used is non-standard.