Every USB 2.0 header supports two USB 2.0 ports.
Every USB 2.0 header supports two USB 2.0 ports.
A single USB 2.0 header generally accommodates two 2.0 ports.
Additionally, reviewing your case shows you possess just one cable for two ports.
The situation applies to USB 3 headers as well; USB Type-C can only serve as one USB connection.