Actually they are AHCI SSDs, M.2 is just the connector type like SATA was and PATA* before it.Ew M.2 SATA SSDs :/
To explain further, about 15 years ago we had IDE drives that used PATA* connectors, these were replaced by AHCI drives that used SATA connectors (which could operate in IDE mode too).
Later we started getting AHCI drives with mSATA, SATA express and PCI-E connectors, and now also M.2.
Now we have newer NVMe drives that use PCI-E, M.2 and other connectors.
* Prior to the implementation of SATA, PATA was simply referred to as ATA (I.E ATA33/ATA100)