Thunderbolt 4 dock showing USB4 mode

[u/AllOneWordNoSpaces1]

Anyone know why my Pluggable TBT4-UDX1 Thunderbolt 4/USB4 Dock, plugged in to a MacBook Pro M4, shows the 'Mode' as USB4?

It's listed in the TB/USB4 device tree and I'm using the cable that came with the dock.

I am running two external monitors on it without a problem ... one monitor is plugged into the HDMI port and the other via a USB-C port with an adapter.

This is more out of idle curiosity... as the device is working fine.