You can then connect many different types of Thunderbolt and USB-C devices to the three ‘downstream’ 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 computer.

To put that another way, if the host computer 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 USB-C technology built-in, then all three ports on the back of the hub will function as USB-C 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 ***

*** Please note, the specifications of a Thunderbolt 3 host system can have an impact on the level of functionality of the hubs’s downstream ports ***

When a Thunderbolt 3 host system that has:

A. An Intel Titan Ridge Thunderbolt host controller

B. A DCH variant of the Thunderbolt host controller driver higher than version 1.41.613.1 installed

C. An internal Thunderbolt NVM firmware version of 41 or higher

Is connected to the hub, then all of the downstream ports will function as Thunderbolt 3 ports.

When a Thunderbolt 3 host system that has:

A. An Intel Alpine Ridge Thunderbolt host controller

B. A DCH variant of the Thunderbolt host controller driver installed

Is connected to the hub, then one downstream port will function as a Thunderbolt 3 port, and the other remaining ports will function as a USB Type-C port.