XG1v4 HDMI Port, is it HDMI 2.1?

Hi, I'm about to purchase a new OLED TV with 4 HDMI 2.1 ports.  In researching if I would need a special cable for HMDI 2.1, it got me wondering if the XG1v4 DVR box has an HDMI 2.1 port.  It is the only DVR box for 4K HDR according to Xfinity.  While the 2.1 is designed for 8K and gaming, it does support 4K at 120Hz refresh rates, which my new TV will have.  So what is the HDMI port on the XG1v4?