They could just be comparing the bitrate of raw uncompressed 4K30@10bit to a compressed H.265 stream They also mention using OCR, so it could be that instead o

They could just be comparing the bitrate of raw uncompressed 4K30@10bit to a compressed H.265 stream They also mention using OCR, so it could be that instead of using a high enough bitrate to read the text they're actually storing the decoded raw text It also looks from their demo video that they might be recording a video of each window separately, so window position changes wouldn't need to be encoded, and it could be a fairly low rate unless it's hosting video?