The LUFA version is 100807, as in the hardware-pinoccio repository. This version is required for both DFU and USB serial firmware. The arduino-usbdfu directory contains the DFU bootloader on the 16U2 ...

The FUSB302 is a programmable USB Type-C controller with USB Power Delivery support. It can detect USB Type-C cable orientation, measure VBUS voltage, and handle USB Power Delivery protocol ...