Yes, the parent's objective clarification below was acknowledged. To be fair, the parent's point wasn't to assert a minimum Ethernet bandwidth that it "could be done in", but merely to highlight the incongruence of the grandparent assuming no compression when transmitting a base case payload over 1 Gbps Ethernet PHY.

I agree that the bandwidth overhead of 8b10b can be dismissed in context, but nevertheless disagree that the underlying functional equivalent of HDMI blanking can be entirely ignored given that's where the audio stream is embedded, with a max +/- 2 ms delay relative to video requirement.

To your point, it's unclear in my mind that even a hypothetical 3 Gbps Ethernet PHY would be sufficient in practice to transmit raw 1080p60 + stereo audio without some form of compression given framing and IP stack overhead, which certainly isn't free; i.e. you'd be at 92.7% link saturation in a completely lossless environment just blindly transmitting raw 1080p60 video data without framing or audio or IP encapsulation.

Irrelevant. The hardware under scrutiny is a chinesium HDMI over IP extender with 1 Gbps Ethernet PHY at best.

It's going to be a while before 10Gb ethernet is available on devices that cost ~$30/pair.