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It looks like he didn't reverse-engineer the Netflix data protocol. What he did is use a HDCP-stripper box to get access to a raw decoded HDMI signal. The HDCP-stripper also had a screenshot function which he used to get snapshots of the video he was playing.

He also monitored how much network traffic was being used while playing Netflix videos to get an estimate of the bitrate that was being played. The 4K videos were consistently around 18Mbps, which is reasonable.

FWIW, you can (normally) get a HDCP stripper from AliExpress for $10. This isn't particularly exotic hardware.

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