Not HDMI 2.1 Certified, and Not Ultra High Speed (according to the packaging at least)
What actually was received was a High Speed 8K Cable, not an Ultra High Speed 8K cable. The box clearly states that this is only a high speed 8k cable, not ultra high speed. Picture is attached. Their is a distinct difference between the two descriptions so I couldn't possibly recommend.
Reviewed in the United Kingdom on January 18, 2022