Question about Satechi 5 Port MultiDevice Charging Station

Goes simpler too:
Includes two USB-C PD ports (up to 20 watts each), two USB-A ports (up to 12 watts each) and a wireless charger (up to 10 watts).

The voltage specification for a USB charging station is not very meaningful. In principle, 5V is available at every USB connection, this is standard. https://de.wikipedia.org/wiki...

There are fast charging technologies (e.g. QC / Quick Charge) where the device to be charged can request a higher voltage from the charger if the latter supports this. But QC also starts with 5V. https://de.wikipedia.org/wiki...
With USB-C, there is USB Power Delivery (USB-PD) with which higher voltages are possible. Here, too, the output voltage is 5V. https://de.wikipedia.org/wiki...
With fast charging technologies and USB-PD, the voltage is never specified, but the technology, e.g. QC 4 (Quick Charge 4).