RST = "Rapid Start Technology“ or better „Rapid Storage Technology“; yes, this is used in combination with RAID setups.
Changing SATA configuration in BIOS from RAID to AHCI in order to recognize SSD’s shouldn’t have any influence on the drives data. It’s probably just the bios manufacturer trying to be on the safe side and not to be accountable for an data loss.
But you may have to “repair” your Windows installation to automatically start with AHCI drivers enabled. Maybe read up on this beforehand; here for example.
[Edit] I just noticed I provided the same link you already had posted 
. Should have followed your links first …