RE:HDMI 2.1
I'm not sure who started that idea. I suppose since the PS5 mentions 8K TV compatibility, somone assumed that might need active HDMI cables. Not impossible, but who knows...
There is that deal with Legrand:
HT8481, the industry’s first Active Linear Cable Equalizer designed to support HDMI 2.1 active copper cables. HDMI® Specification 2.1 is the most recent update of the HDMI specification and supports a range of higher video resolutions and refresh rates including 8K60 and 4K120, and resolutions up to 10K. Dynamic HDR formats are also supported, and bandwidth capability is increased up to 48Gbps. Supporting the 48Gbps bandwidth is the new Ultra High Speed HDMI Cable. The cable ensures high-bandwidth dependent features are delivered including uncompressed 8K video with HDR.