There’s a story going round that Lenovo have signed an agreement with Microsoft that prevents installing free operating systems. This is sensationalist, untrue and distracts from a genuine problem.
The background is straightforward. Intel platforms allow the storage to be configured in two different ways – “standard” (normal AHCI on SATA systems, normal NVMe on NVMe systems) or “RAID”. “RAID” mode is typically just changing the PCI IDs so that the normal drivers won’t bind, ensuring that drivers that support the software RAID mode are used. Intel have not submitted any patches to Linux to support the “RAID” mode.