For displays that connect through USB-C, do you provide a video capable USB-C cable?

No.

Here’s the long answer:

We do not include a USB C DisplayPort capable cable because the maximum length is limited to “Cable length should be 2.0 m or less for Gen 1 and 1.0 m or less for Gen 2.”     This would only leave about 0.6m (2ft) of cable sticking out of the back of the XOOT_Pro arm.  That is not enough slack for most customers.

Instead:

We include a 3m (9ft) USB C to USB A cable (usb spec 3.0), this is the same length as the included video cables.  This ensures that all cables should be long enough to reach most customer PCs.