You can then connect many different types of Thunderbolt and USB-C devices to the three Thunderbolt/USB-C ports on the back of the hub.  The type of functionality provided by the three ports on the back of the hub is ultimately determined by the capabilities of the host PC. 

To put that another way, if the host PC has Thunderbolt 4 technology built-in, then all three ports on the back of the hub will function as Thunderbolt 4 ports.  

If the host PC has Thunderbolt 3 technology built-in, then all three ports on the back of the hub will function as Thunderbolt 3 ports. 

If the host PC has USB-C technology built-in, then all three ports on the back of the hub will function as USB-C ports.