PCIe x4 SSD and PCIe x4 slot

Want to know the second slot is PCIe Gen 4 or m 2 4 0 in 3 0 slot Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4 m2 slot 2 standard contains variants with up to four PCIe lanes, one SATA 6 Gbs and or one USB port So it is possible to connect PCIe as well as SATA SSDs

m2 pcie slot 2 GTs PCIe Gen2 4 GTs PCIe Gen3 8 GTs