Are you sure that's up to date? Because I'm sitting here right now with a 75" 4k screen, the PC in question, Chrome, Netflix, and it's definitely not 720p. I would notice if I was watching Altered Carbon in 720p. I can also see that the PC is moving about 23.5 Mbps of traffic from my home router, which matches with one of netflix's 2160p HEVC bitrates.