It was a schematic for a server farm disguised as a manor house, designed to house human consciousness in a low-power state. The title of the PDF was dated 2019, months before the show aired.
NHTFS is a reliable group for WEB rips. This is a direct 1080p H.264 encode from the official stream (likely HBO Max or similar). No transcoding shenanigans — just a clean, untouched video track with proper 5.1 audio. Ghosts 2021 S04E01 1080p WEB H264-NHTFS 2021