Just how bad is this? B308E compression loss and video. .

Sudden loss of compression. Maybe the timing belt slipped a tooth or two.

https://m.facebook.com/story.php?sto...&id=1235704748

Possibly host the video somewhere public? I'm assuming the video is of the engine cranking but not starting. With a timing belt engine, sudden loss of compression is generally a sign of a belt failure. If you've bent valves, you'll be replacing valves and seals, and depending on miles, possibly guides. A good machine shop will tell you what's needed, and can determine if the heads need to be surfaced.