Can an slot ONLY support NVME and NOT support SATA?

Yes, your notebook has a slot that supports both SATA and NVMe SSD''s NVMe SSD's would provide faster readwrite

Dual-Mode Slot Design Support both PCIe NVMe + SATA SSDs GIGABYTE Motherboards are built with dual slots With a PCIe NVMe + SATA dual-mode

slot demo pramatic 2 SATA-only SSD slots support it NVMe is optional You can use an PCIe NVMe SSD with an PCIe slot that doesn't support NVMe---the

slot receh gampang menang slots in 1U or 1 PCIe x16 expansion slot in 2U Supermicro All-Flash NVMe By configuring 10 NVMe SSD drives out of the available 24 all-flash NVMe