In a new video posted earlier today, Eve claims that HDMI 2.1 on its Spectrum gaming monitor is now working. The video shows Spectrum connected to an Nvidia GeForce RTX 3090 via an HDMI cable and running at 3840x2160 at 144 Hz, which is only possible on HDMI 2.1. The video noticeably does not show content or gaming at this resolution on Spectrum, and it should be noted that the video is limited to 1920x1080 at 30 Hz, making verification impossible. While many are skeptical of this achievement, it may be that Spectrum now supports HDMI 2.1.
https://www.notebookcheck.net/Eve-shows-off-HDMI-2-1-working-on-Spectrum-monitor-in-new-video-gives-update-on-Spectrum-testing-and-development.533664.0.html